I had it done in my twenties - my nose was wide with a big bump - looked like a lump of putty really.
I was in for about 24 hours, but I had a bad reaction to the anaesthetic so was glad not to be kicked straight out. When I came around from the op I had a lot of packing in my nose which was removed before I went home (if you've seen that magic trick when the magician removes a massive string of scarves from a top hat that will give you some idea of how much was stuffed up there!), and I was left with a "beak" which stayed on for a week.
Did it hurt? No, not really, not as much as you'd expect. Yes, it ached, and there was some discomfort (and it was quite sensitive once the beak was off) but really it was fine. There was some impressive bruising (two black eyes which went progressively purple and green) and swelling, which took a few weeks to thoroughly clear, but after a week I was able to go out and about, just using a bit of concealer for the bruises.
I didn't tell anyone beforehand, apart from my parents and a couple of close friends. It was amazing how few people actually noticed. Coincidentally I had just had a drastic haircut, and most people thought that was why I looked "different".
I had no regrets whatsoever. My new nose was/is perfect and it gave my confidence a massive boost. I understand that rhinoplasty has a high degree of success, ie not as likely to fail as many of the soft-tissue plastic surgeries (facelifts etc). I would recommend it to anyone.