Surprisingly good. I've had ONE bad reaction, years ago, from my father. That's all. So far, everyone has either not cared at all, said that they already knew I would eventually say something like that, congratulated me for my courage or expressed a will to help. Sadly, no heavenly money offer from my relatively rich aunt and uncle, but that would be a very, very lucky occurrence, wouldn't it?
And ya know, I live in a not-so-populated northern city with a mayor who is currently fighting the court with money donated by the population to keep his prayers before city hall meetings. So I was somewhat afraid. But nope, I was afraid for nothing.
From what I know, MOST of the time, our fears aren't justified when it comes to coming out. I'm not saying there's absolutely no chance that you'll run into problems, but that it's probably a lot less likely than you think.