Had mine done a few years ago. Lying in hosp bed and the most gorgeous lady consultant came and gave me a good pre-op exploration! She told me I would have a general anaesthetic as the vas deferens (pipework) was deep, so I never felt a thing. Back at work the next day in the afternoon and no pain at all.
PS When I got to the hospital a nurse gave me a razor and told me to go into the bog and shave (not the whole area, just the s crotum), so it may be a good idea to do this beforehand.