Hi again, beautiful Saira!!

These are some great advices!! It's so beautiful to see we helping each other.

Well, I also wrote a few thoughts that I really hope that could be of any help for you and others in the same situation. So in my opinion, I think you may want to do some or all of these steps:
PREVIOUSLY:
1. Be absolutely sure that this is what you want!! If you are not still sure, do more research. Experience with your body and your habits. Talk to other transgender people. If available, do some psychotherapy sessions - they really help!
2. Being sure about it. You need to do lots of research. Are there doctors or public health services specifically for transgender people in India? Or even private. This is something really important to find out!
Look for ONGs, human rights groups, LGBT associations or other trans people nearby. They might help you much more than you imagine.
3. Talk to a medic, specially if you find out a doctor with experience with trans people. The doctor might help you to be better prepared, may access your health condition previous to any HRT and may give you the gender dysphoria diagnostic - what, as Denise pointed out, might help you with telling your parents.
4. Try to verify what your parents think about transgenders. This might reeeeally help about anticipating possible reactions and scenarios, and could help you to plan better your strategies.
Do you use to see movies together? I'd really recommend you to watch
The Danish Girl with them.
You'd like to pay careful atention on what they say or think. You might want to make some questions about the movie and use the moment to reinforce that you think the character happiness is the most important thing; that the secondary character was amazingly supportive and something (sorry, a little bit of spoiler here).
Be ready to open up your heart as you attitude might raise some suspicious on them.

Your parents are health workers, right? You may told them you've read about gender dysphoria as ask them what they think about it. Or use any other source of information or news to bring the topic up to them and promote a sincere dialog about opinions.
5. Based on all the information you gathered, write down some speech, anticipating possible reactions of them. You don't have to memorize them. Just write down, it will help you to organize your thoughts and be more ready to talk to them.
6. Prepare lots of technical and helpful information about transgender to be ready to provide them as soon as you tell them about your situation. This might help them to read and research more later.
7. If you think they could be really hard, with the risk of sending you away (sadly some parents are just like this), be prepared. Have a B plan about where could you go and what could you do about your life. Get friends and organizations' support.
TELLING THEM:
1. Based on what you discovered earlier, you may identify if you would expect any harsh reaction from any of them - or both. If you find one of them is more inclined to accept you than the other, you may consider talking first with this one privately. This person may also help you to tell the other one.
2. If you think they can be really aggressive or disrespectful, and you don't want to confront them directly, you want want to think about an indirect approach.
DIRECT APPROACH (FACE TO FACE):
1. I'd recommend you not to go directly to the point, as this may cause some shock and make it difficult to have a clear communication.
- Ask them if they have one hour to talk. Be sure that you won't be interrupted because someone has to leave for work, or something. Pick a good timing.
- Start talking about your happiness, your feelings. That you feel there is something really wrong about you, and something that makes you terribly said.
- Ask them if they have noticed you are said, or if there is something different about you. Maybe you might be surprised with their answers.
- Tell them that ever since you read about gender dysphoria you started to understand yourself. And you really wish them to also help you understand yourself. Remember to reinforce the technical term gender dysphoria, as this might give them a concrete scientific approach to focus and give them something to research by theirselves later.
- Ask them what do they think about it. Make them involved. Don't only talk, but be sure they are understanding and participating and willing to give their opinions.
2. Sincerely thank them for hearing you and trying to understand you. Tell them you love them!
INDIRECT APPROACH:
1. If you are really scared about a direct conflict, you may want to think about an indirect approach. I mean, make them "discover" without being there to face the first impacts of the shock. This might give them some time to cool their minds and think about the situation.
2. But I'd recommend you to always prefer the Direct Approach, even thou it seems harder, it may really help to explore the family feelings and expectations.
3. Indirect approach might be:
- Writing a "formal" letter explaining all the situation. It would help you if you use the same development we've talked about before: not going directly to the point and focusing on your feelings and on the gender dysphoria diagnostic. You can deliver the letter directly and ask them to read alone when they have some time to think about what you wrote. Or you may leave the letter on their bed or something...
- Remember the letters you were writing in the beginning, preparing yourself to talk to them. Well, you could accidentally forget one of them on a place you are sure they will find.
- Recording a video where you tell them everything. Some people like this option as your parents can SEE your emotions and feelings and avoid you from direct confrontation. It is more personal and emotive than a written letter.
- Recording a voice message. I personally don't like this approach.
AFTER TELLING THEM:
1. If you have any suspicious that they can became aggressive, even physically, anticipate this scenario and avoid putting yourself in a position where you may get hurt. Keep a safe distance, don't let them be between you and a possible route of escape (like the main door) and be ready to leave if things get out of control. Do not ever confront them physically and avoid verbal confront.
It might seem a little bit overcautious to think about this scenario, but in some macho societies some parents - and specially fathers - can go that far. Avoid putting yourself in this situation by knowing your parents, knowing previously what they think about transgenders and if they ever became aggressive when facing a hard situation.
2. Don't expect them to accept it and understand it immediately. It is something really new that changes the image they have build about their son. Give them some time to digest all the information and feelings. Let them know you are there if they have any question or if they still need to talk.
3. Provide them with good information material about transgenders and gender dysphoria. Let them research and understand the situation on their own pace.
4. Please be more emotionally close to them. Let them see you are the same you ever been, you just want to be your real self. Let them see that you love them and this would never change!
5. In the worst scenario that they send you away, do not let it destroy what you feel about them. Try to put yourself into their minds and understand their motivation to do it. Try to maintain contact through visits, letters or phone calls. Always tell them you love them!
CONSIDERATIONS:
Normally, parents do love their sons and daughters, and they can't stand seeing their "children" suffer. Every parent love to see their children happy. It is all about love!
Some situation might numb a little bit the parents reactions. They may be very upset, thinking you are committing a big mistake, doing something terribly wrong and blind to the truth. They may think you are lost, sexually perverted or under the influence of someone or something.
All these thoughts are very bad and are able to produce very strong feelings that may temporarily surpass the good feelings they feel about you.
Please try to see the situation through their eyes, identify possible defensive mechanisms that might be running and be ready to clarify all your feelings. Repeat a thousand times any information if they need it.
If you feel like crying (normally we females do), please do cry. Let them see your true feelings.
Give them some time. And do not ever forget to tell them you love them no matter what!!!