Good luck with the surgery. My only advice - make sure you keep all of the follow up appointments, especially the repeat paps.
I had a low grade lesion about 3 years ago, had the colpo done (not horrifically uncomfortable) and the cryo (still not really bad, I thought) The doc did tell me to take 800mg ibuprofen about an hour before. Conpared to some of the infertility testing I went through (hysterosalpingogram.....), I didn't think the colp or cryo were bad. The head rush after the cryo was something else though. Good thing the doc warned me to lay down for a while, and that it was going to happen.
Jen