We arrived in hospital probably around 7am (it's a while ago, so not sure of all the details now). He was seen by the anaesthetist (who decided he didn't need a pre-med) and the surgeon. We took him into theatre at around 8.30am and stayed with him until he was under, then went back to wait in DS's room.
We were expecting the op to take about 45 minutes, but it took a bit longer - over an hour. It was more complicated than first thought (the surgeon had to stitch the testes into the scrotum which isn't typical).
The nurse told us when the op was over, but it was a while before we could see him as he was in recovery. Back in his room, he slept the whole day, waking up in a very cranky mood around 4pm. He was forced nibbled some toast and had Calpol for pain relief. We took him home around 6.30pm and he slept on the couch for the evening, before being put down to bed.
Next day he was absolutely fine. His dressings, iirc, were just some large pieces of clear tape, and his nappy. We must have had some instructions about removing them, but I can't recall them now. We didn't have to go back for a checkup - just to check ourselves that his jewels were still there when he had a bath over the following months.
The only post-op pain relief was Calpol and I think even then we only gave it to him for a day or two.
He was left with two little scars, which I imagine are well hidden now.