Well, considering you can easily pull down the foreskin when you're soft (according to an older post of yours), I don't think it's necessary whatsoever.
So... I'd like to ask, why? You said in the other post you want to fit in. Don't forget, you're the one who has more. And if it not working properly is a big reason why you don't like having a foreskin (it was the case with two of my friends so far), it could be a good idea to make it work, and if you're still not content with a fully functional penis, then oh well, at least you tried. Not like you need to hurry.
But to answer your question, yes they do anesthesise your penis or you as a whole, and if done right the operation itself doesn't hurt -- recovery may, however, be uncomfortable and painful: 1) the head is sensitive 2) any healing wound hurts.
They say you aren't supposed to masturbate for about 4 weeks after the operation (if I remember correctly).
If they mess it up, it can bleed a lot. If they mess it up, they can cause severe nerve damage and you can end up with numb areas. This is not likely, but nevertheless possible.
Also, it is (according to people's reports) completely different to masturbate a cut cock than the uncut one. Keep that too in mind.
The head's sensitivity goes away gradually, it'll significantly lessen in the first month.