topspinner...pre-op for me was weight and waist measurement, blood draw, meeting with nurse (lasted over an hour) to go over pre-op diet and everything leading up to surgery day as well as the diet post-op and what to expect on surgery day. The whole thing from beginning to end was about 2 plus hours. Lots of info, bring some sort of folder/large envelope to keep all your material together. Tons of paperwork and booklets!