If there's one mistake that I've made over and over again in transition, and that I'm only now learning from, it's basically NEVER make a big deal out of something or ask special permission unless someone else makes it a problem. People have VERY wrong notions of what MtF transgender people are. Most people equate "transgender" with "cross-dresser," and they automatically see what they'd consider to be "icky" images of someone with a 5 o'clock shadow wearing a pink dress. So you're selling yourself short by mentioning that, and making people WAY more afraid of you than you need to be.
Apply, don't talk about your trans status on the application, show up at the interview, and don't even mention your gender identity unless they themselves ask you about it. Basically, don't make a big deal out of something that probably wouldn't be a big deal if they'd just see you and talk to you without the stigma of knowing that you're trans.
Be yourself, be unashamed of who you are, and have an attitude of "why the hell would you think that there's anything wrong with me? This is who I am, I'm just living my life, and if someone has a problem with it, that's not my problem, it's theirs." Basically, don't create problems that might not be there in the first place. I got fired from two jobs in a row because of this exact tendency to ask for special permission, constantly apologizing for myself.