Hi Windlep.
Like you, I have Aspergers and I am transgender. Unlike you, every time I looked into transitioning I found a reason not to, and now I am 52 and still have not transitioned.
I did a pretty fair job of living as a man. I got married, had a kid, got divorced, got remarried to someone much better, and things were going along okay until about ten years ago, when I started having anxiety and panic attacks and high blood pressure, and really did not know why.
Until late last year, when I found out that crossdressing "mysteriously" lowered my blood pressure and stopped the panic attacks.
You can make lots of excuses not to transition. For me, the first go around, in college in 1982, was that I was a broke college student, and all the transgender resources in the U.S. were on the opposite coast, and you had to pay for everything yourself. The second time, in 1990, was that it was classified as a mental illness, I had just finished law school, and I did not want to lose my law license. The third time, in 2000, I saw a pretty little non passable transgender girl get mistreated in court by a judge, and I was going through a divorce and a custody fight over my son.
But even though I convinced myself three times that I was not transgender, it eventually caught up with me, and the stress of living as a man started tearing my body apart.
Don't worry about whether you will pass. I have a big nose too, and I figure a plastic surgeon can take care of that pretty well. And magical little things will happen when you learn what clothing works well for you.
I can tell you one thing. If you truly are transgender, fighting yourself will only cause a lot of pain, while living as yourself will bring contentment and happiness.