In answer to your questions.
My OB did it, a fact that I knew about in advance from a friend si I had already discussed it with him beforehand. He still made me give him reasons why I wnated it to be done. I know a couple of paeds in our area will do it too.
Riley had the emla gel on beforehand to numb it and had it done in the nursery (at 2 days) so I wasn't in the room, when he came back 10 minutes later he was settled and I just gave him a feed and he went to sleep.
The aftercare was fine, we had no dramas at all, he has had worse side effects from his needles.
No I do not regret it at all.
May I second everything Neverplan has said too, that has been my experience as well.