I want to go for it but I'm worried about a big reaction. I think I'll delete all the people who I think will be a**eholes about it. Any more advice?
I'm of the opinion that putting anything on facebook only happens if I am comfortable with the whole world knowing it. Your profile says for example that you are out to 'some' family. In my experience those family that you haven't told will find out eventually once it goes on (unless you've managed to keep some amazing boundaries between facebook and your family ). If you've told everyone you planned to tell personally, then I say go for it! Get rid of anyone who complains, but don't make too big a thing of it!
You seem to have thought it through pretty well already. Like EllieOtaku says, expect everyone to eventually find out if you put it on Facebook, the international gossip channel.