Hi craftylass and welcome!
I was nervous about
having my rectum removed, too, and was surprised by how easy it was. I did not have to go into ICU after surgery and was in a regular room for only 4 days before going home. I was able to sit without very little pain and even started driving two weeks later!
My surgeon left the 'butt wound'
open, so it could heal from the inside out. I packed it twice a day with saline filled gauze, which kept it from getting infected. It took a few months for it to completely heal up, but it didn't hurt, so I was able to go back to work after 6 weeks. I'm a church secretary, so I spend a lot of time sitting and working on the computer, and it didn't hurt to sit all day.
I hope this helps answer some of your questions. If you have any more, please feel free to ask!
Cecilia