Hubby had his right knee replaced a year ago last month. We are full timers. What I did was take pictures of the RV where we thought there would be problems. Took pictures of the steps outside, inside, the toilet area. We gave these pictures to the physical therapist and she gave us suggestions.A good rule of "thumb" is when using the stairs is "the good (foot) goes up and the "bad"(foot) goes down" Like heaven and he.. Of course every recovery is different, due to age, weight etc.He had no problems except having to stop and think the heaven and h... thing.
The rehab part as everyone has stated is the most important part of recovery, but I am partial to that as I worked as a physical therapy aid for years.
Good luck!