My biggest trigger right now is that I'm managing my dysphoria while presenting as mostly masculine. That makes me think that maybe it's all just been a bad dream, and that it would be way easier to not transition (too late, boobs!). I still present as somewhat feminine even on days when I don't feel it, so the only (pro-femme) dysphoria I get is when I'm dressed femme enough that I expect to read myself as female. That can serve as a reminder to bring me back to reality, but usually the thing that does it is a positive experience that affirms my femininity.