I also know lots of people who had knee replacements and they are much better for it. PT did come to the house for my mom. As long as you are diligent on the exercises they have for you and have someone who can help get the compression socks on, you'll do fine.
I am worried about your colitis. You won't be able to be running for the bathroom while that knee is healing. But you can get a porta potty and put it near you. Mom had to. Lots of things were donated to her by the senior center of from friends who no longer needed their canes or walkers after healing. The potty chair was provided by the hospital.
Hugs!!!!