For me I was pain free, I had my surgery on a Thursday and could have very easly gone back to work on the Monday, I booked two weeks off, I took advantage of my time off but I could have gone back. I did have gas pain, in and around the stomach not so much at the other end, haha. When I had the gas pain I would walk it out. I was an easy case so I would say you should be fine, but maybe let your boss know that you will come back and work half days for the first week or book more time off. The sitting part was not an issue for me.
I hope this helps, I hope more people post so you get a varity of answers,
Good luck and welcome to BANDLAND!!
Jenelle