I used to think that transitioning was like escaping from prison. Lots of work, lots of planning and scheming, secrecy, etc. But as I've progressed, I've found it's more like crossing the border into Canada. Sure, there are mean-looking Gate Keepers with guns and surveillance equipment and walkie-talkies and fences, so it looks a lot like a prison gate -- but they just glance at your passport and let you by, and then you can say without any tension, "Hey, I'm in Canada now." And nobody will challenge you -- why would they? Nobody cares -- why should they?
I don't have to tell anybody I'm a woman. I just am.
It's taken some effort to be sure -- that's what the "mental transition" is about for me -- but the effort was mostly about convincing myself not to worry about what others might think and to quit apologizing. Once I did that (and I'm only talking about the last two or three months), transition changed from a great hurdle I had to overcome to a tedious chore I have to complete.
Is my face feminine enough? Is my voice okay? Are my clothes always appropriate for the situation? Do I act in a feminine manner and avoid masculine patterns of interaction? No on all accounts -- at least not to the point that I can present as reliably invariant as a woman, not to my satisfaction. But so what? I'm getting there, and as long as I keep working at it, I'll eventually arrive at my destination.