As long as you end up passing, the vast majority of people will end up accepting you, even if they have trouble at first. To this I'd like to add that probably 90 % of people convinced they'll never pass properly and be pretty are completely wrong. And of the remaining 10 %, half are partly wrong, in that they might not exactly be pretty but they pass just fine, and/or they still don't think they pass but they do to the rest of the planet.
I haven't seen you with my own eyes, but if you've been told you have a lot of potential, I think I can safely bet you're among the 95 %.
And even if you're in the unlucky bunch, it's still a majority that'll accept you. You'd be surprised. As long as you have the right attitude about it (that is, just generally acting normal and not being an ass), things will go really smoothly. The only exception is maybe Bible Town, Texas (stereotypes, I know~). And even then! I've heard of people in very religious communities who were, surprisingly, widely accepted!
So far, I've had nothing but good surprises regarding people's reactions. Apart from my father, but we've never had a good relationship. And I'm far from living in a big city where people actually know transsexuals, oh no. Yet everyone I've come out to has been at the very least okay with it. Some are also pretty curious and ask bland questions, but it can't be helped. :p
You said you liked video games, right? Ever tried Dungeons and Dragons? Having a lot of people not accept you is a critical failure. 1/20 chance. And having people hate you for what you are is probably a critical failure on the second throw as well. 1/400. I'm not a statistician, but this sounds like a pretty advantageous lottery. Not to mention that contrary to a die, you can help your chances with your actions and how you do the coming-outs (letters are a great idea IMO by the way).
Unless doctors play with you like they did with me (and it would appear I'm a pretty rare case of bad luck), fighting the anxiety and gathering the courage to come out is by far the hardest step, and if not, it's close. After you do, it's all going to go more smoothly. You can just gradually be more yourself as you feel comfortable with it and before you know it you'll look like a girl.
Often you're accepted surprisingly well. Sometimes you have to work a bit to have them accept you. Rarely will acceptance be really hard to achieve.