I haven't done knees yet, but 5 hip replacement/revision surgeries and a handful of other orthopedic surgeries. I would not do both knees at once, unless you absolutely have to. Why? You never know the exact outcome of any surgery, and if there are any "glitches" you need at least one leg to stand on as you deal with them. For example, one of my hips dislocated after revision - if both had been done at the same time, I would have been confined to bed until it was repaired, setting my recovery on both legs back. Also, concentrating on strengthening and stretching one new joint at a time is plenty - and what if the recovery progresses at different rates on the two knees?
@heyjoe415 Do you have any suggestions to daa?

If I were you, I would do one knee at a time. Two knees at once is just too much. I know someone who had it done and was in terrible pain. The recuperation for both knees at once was very difficult. I had my right knee done about five years ago. It was a very rough surgery and I was in terrible pain, only being able to take Tylenol due to pain medication allergies. My husband helped me but it was also very hard on him. I have decided to not have my other knee done, although I am in pain with it and it is bone on bone. I just can’t go through it again! If you do one knee, you will have your other knee to help you balance, walk etc. My advice is to take it one at a time. All my best wishes to you. MaryAnn from Boston