I had it done a couple of years ago on the NHS. Most painful part was the surgeon jabbing my balls with a scalpel to see if the anaesthetic was working. For the next week afterwards I occasionally felt a little twinge if I moved suddenly. (if the wife is reading I'm just being brave, I really needed waiting on hand and foot for a week, honest). It was a bit strange this fit young bird holding my cock out of the way while the surgeon did his bit.
They did say to avoid sex for a few days but I think I was keen to check it all still worked. Then you have to have sex every day for a month to clear the tubes before the checkup a blowjob is the best option for this)