Hi Arianna,
Congratulations on moving forward.
First thing you may experience is an overall calming effect. As time goes on you may feel a pins & needle type pain in your breasts. This is them starting to grow. Depending on the HRT regime you are put on, your toileting habits may change to be more frequent, and perhaps with a slight urgency associated with it.
Your thinking may change and you may see things in a different perspective to the way you are currently used to. You may find your eating habits and preferences may change. Your skin may start to feel smoother. Usually takes a few months for fat redistribution to take place
That list is not exhaustive and you may find other things like you sense of smell becoming more acute, or your hand eye coordination becoming faster.
This will be the time to just observe, enjoy and celebrate whatever happens for you. It's yours and quite unique.
Be safe, well and happy
Lotsa huggs
Catherine