Allison
As you are already off to a great start with supportive parents, an appointment made with a gender therapist and having found Susans you appear to be doing fine. Read, ask questions, find a support group, take the time to understand, accept and learn to express your identity in the most authentic way possible.
If you transition it really is a transformation. It takes time but there are many who are either further along the road or at a similar stage. Never be afraid to ask questions or to seek support. We are all here for each other and wish you well.
Safe travels
Aisla