Had it done about 10y ago (no scalpel technique). Moderate pain for a few days (a couple frozen water bottles kept in the fridge at work were my friends at the office). I was one of the small percentage that got pain afterwards, basically only after cumming. The first few shots afterwards were pretty sore (bad ache in the balls). After that the severity dropped to the point where it was fairly minor, but a mild pain after an orgasm. That happened for several months, maybe a year. Still, was glad I did it, no regrets, wish I had done it sooner.