Well there's the fear the docs will find some mystery illness to deny me HRT (low chance, but there)
There's the thought I'll grow a bald spot just in time for transition.
Somethings are really weird. Like how I used to like my hands and wrists for being small and womanish, and then I look again, and sometimes think they are too big.
Or wanting to slim down, to lose mass, and then thinking, "Gee, if I lose fat, there goes my hips and breasts!."
Or the thought that I'd be "faking" it one day or another, as if the girl in me decided to take a nap at the wrong time.
And there's the basic intrinsic fear of being seen as a man in woman's clothes.
I'm a stop myself now