Wow. Talk about the shoe being on the other foot.

I think that, once the shock of this subsides, this might be really bloody cool! In a really weird sort of way. At least now you get to know what it feels like from the other side of transition, I suppose.
As for your sisters, hon, from what little I've gotten to know about you from reading your posts, you are nothing like them. When you transition, you won't turn into them, you'll stay you, just with a brain and a body that fits. They will probably disapprove, maybe even get mad and mean to you, but honey, you are stronger than they are, and whatever their opinions, just let it wash by you. They have no hold over you but what you allow them to have.
Don't let them keep you from living your real, authentic own life.
~Simone.