I think, for me, the hardest part is dealing with the friction between the prospects of living as a man and presenting as a woman.
Sometimes I feel trapped.
Transitioning is hard. It feels like I have to claw, scrape, and clutch desperately for each scrap of self-esteem and dignity. Learning how to wear the right clothes, re-learning how to talk - these things are incredibly difficult, and yet even the slightest mistake can have drastic personal and social consequences. And realizations like, "oh I wouldn't have to go through all of this if I had gotten HRT sooner/had gone through the right puberty/etc" sometimes get me down.
At the same time, I can't live as a man. It just isn't possible. I'm a lady. Forcing myself to live like a man is, literally, death by slow torture.
So that leaves me with only one real path to take: transitioning. The prospect of transitioning is overwhelming, but I've been forced into it. So much to learn and re-learn, so much to take in all at once, so much uncertainty. It's terrifying.
It's terrifying, but... now that I'm actually doing it, I'm finding it's not that bad. Certainly less confusion and fear than going through the wrong puberty, or trying to live as the wrong gender.
I've actually become a stronger person since I began transitioning. I still feel fragile and overwhelmed, but I've gained a lot of certainty and confidence just by taking concrete actions to live as a woman. When I look at myself in the mirror, I see a lady now - sometimes I even smile at myself. I have a name and identity that doesn't make me cringe and think of self-harm. These are things I've never had before. I can't pass quite yet, but I'm happier than I've ever been in my life.
Every day, the endless list of Transitioning Stuff I need to learn and keep track of seems just a little less daunting.