I'm up in Phoenix. The Tucson community is more advanced than the Phoenix one. There are some good therapists down that way, but be careful of the few that are preaching rather than consulting. If one therapist is not helping, go to another. It is their job to make sure this is right for you, once started, some of the effects are irreversible, and they must make sure it is not a "high" or impulse. Once you start surgery, effects are irreversible, you will become the assigned gender. The suicide rate is high before transition decisions, and still has a strong incidence after, when someone decides, omg what have I done, so they should make sure this is what you want. There is an increasing incidence of post surgical identity dysphoria occurring, but I attribute that to failure to maintain an adequate regime of HRT, (at least 3 years post SRS), otherwise too many are being maintained at post menopausal levels.
As for an endo, they generally will not start HRT until they get a letter, and many of them are at a loss of what to give and how much.