It mostly is quick snip and no worries. Mostly. I've been told that the discomfort after is like the residual pain of a good kick in the nads. Not the part that makes you want to puke, but the "damn, that aches" sort of feeling afterward.
If you rest like you're supposed to- you'll mostly start feeling like yourself again in a couple of days. In the meanwhile - elevated legs and ice are your best friends. A big bag of frozen peas is THE best icepack ever for your bits.
Sex can resume anywhere from 72 hours to 2 weeks later - but it takes 10 - 20 times ejaculating before you can be assured of sterility.