i've sent a couple of guys in that age group for the procedure, for a medical reason, and yeah...it hurts. fortunately, it's epithelium in a high turnover area, which means that healing can be pretty quick (provided you have a healthy immune system).
after the procedure, the head of your penis is wrapped in petrolatum dressing (a gauze pad soaked in Vaseline). you keep it on for about 24 hours, then they have you take it off and encourage you not to have any erections, or wear any underwear for a couple of weeks. the erection part is the toughest - i mean, we bone up for NO REASON most of the time 😉
the more important question about circumcision, however, is why are you doing it? (more rhetorrical than geared at the OP). There is really only one medical reason I know of, and that's phimosis (a painful tightening of the foreskin, freqeuently leading to episodes of balanitis, or inflammation of the penile head). Otherwise most circumcisions are done for religious reasons. Personally, I think we're born with the turtleneck sweater for a reason, so I have discouraged more men from the procedure, than referred.