Rachel,
It usually has to happen and is greatly freeing. However, it is also terrifying. Try to stay positive. Try to stay grounded and breathe.
Remember, you are not alone. It does not always go well but it can be okay anyway. Try to write or talk about it when you get the chance. We will listen but it might be better if you have someone you can look in the face and physically hug. Is there someone who is safe and loves you unconditionally. It is also good to try coming out with someone like that as a practice.
I wish you luck, love and a smooth journey.
With love,
Joanna