The pool is a great suggestion. I had my knee replaced when I was 19 due to severe internal injuries that caused end-stage arthritis at an early age. My regret, because my recovery was not great, was that I don't think I was diligent enough with my PT. PT hurts and I don't think I was mentally prepared at 19 to push through that. Obviously, you don't push through sharp excruciating pain, but preparing yourself mentally that it will be hard the first few months and knowing you have to push through with your PT will put you on a better path for faster recovery and better range-of-motion. We are all different in how we respond to surgery and how we recover, but we are all similar in that we have to be consistent with our PT.