If hormones is what you wanted to do and they feel that it is right for you, they will write you a letter that you would take to either a GP (if they are willing to prescribe hormones) or the GP would refer you to an endocronologist. I think there's a whole bunch of information about this in the Wiki.
By the way, why do you have your shirt off in your profile? Love the hair. Also, you're cute there, so I think you would probably end up making a pretty decent looking girl.
Melissa