Hi Stephm,
Beginning HRT is a huge step. It's such an empowering feeling to finally be doing something practical towards alleviating something that has caused so much anguish over the course of your life.
For me, the most profound changes that have occurred since starting HRT have been psychological, mainly the reduction of the despair, anxiety and depression due to dysphoria. The despair I felt previously has now been replaced by hope, and there's every likelyhood it will be the same for you.
Congratulations, and get ready to enjoy the ride!