In my info pack for srs it had a diagram were to get hair removal done, and they recommended who could do it, i'd say I had about 20 hours done, something like that. had to stop few months before surgery day. I had a couple of hairs pop up like 3 weeks beforehand and I freaked out and rang surgeon, and they said, doesn't matter we don't require any electrolyses. I was like agh contradictions
So probably need to update their info pack, that said it all depends how much hair you want down there, I'm going to get some more done to tidy things up.
As for pain, it hurts. They will have numbing cream there though it doesn't seem to make much difference, in the end I went without it as it makes it harder to see fine hairs.