I recently had the procedure,10 days ago, and feel I've had two experiences in one.
So drop your pants, lie on the table legs apart. No problem. Bit of cold spray, then injection into scrotum. Slightly painful but not too bad. Then incision, tube on right testicle pulled out and snipped.(yes you do feel exactly what's going on) uncomfortable but not too bad. Now to left testicle! Firstly I have noticed over the years, I don't like my left testicle being touched as it is sensitive/painful. A gentle friendly cupping feels like it's been put in a vice. But holy crap, the pulling and cutting of the tube on this side really,really hurt. It seemed there was absolutely no effect from the numbing whatsoever. Anyway went home no really problems. Sex drive feels fine, right testicle feels ok, as described by others I know,who have had the op. But lefty, feels like I start everyday with a kick in the testicle by an angry horse.
I'm hoping this goes, but I'm not convinced it will, it seems to have exaggerated a "sensitivity" I already had. What I would say to anyone looking to have it done, if you've got "normally" sensitive testicles,like my right side, then it's no big deal, if however you have painful testicles, like my left side,then prepare for pain!!
To add, I am someone who is accustomed to pain and is known to have a high pain threshold. Good luck.