Just find a good therapist, one who is familiar with LGBT issues.
Yes, there are a few doctors out there who still classify transsexualism as a mental disorder and will only prescribe transgender hormones and surgery to those who fit a very narrow definition.
But if you find a good therapist, one who is familiar with the community and recognizes that it's not so much a disorder as a matter of self-identity, and that gender identity is completely different from sexual orientation, masculinity/femininity, and any number of other heteronormative assumptions, you should be just fine.