I have had both knees replaced at different times. There is actually a thread on this subject which may be of use to you rather than us lot repeating ourselves. The most important thing is finding a decent orthopaedic surgeon! Look at the other thread, it is not as straight forward as a hip replacement. Good luck.
As others have said, pick a surgeon who specialises in knees and do your exercises religiously both before and after surgery. Ten years since I had mine done, six months apart, and I am still appreciative of the difference it has made to my life. Go for it!
Two knees done. Wonderful. BUT the most important thing is physio. Do it rigorously . Two crutches , then one, then stick. Well that is how I went and then nothing after six weeks. Hope that helps. What a change to ones life.
I was just thinking today how glad I am that I had both knees replaced. Its not great for a while afterwards but is sooo worth it. Unlike fernbergian, I found physio exercises to be counterproductive. I did them religiously after first knee op. Result--inflammation leading to adhesions. I needed a manipulation under anaesthetic. Second knee I was wiser and refused physio. I iced and elevated my knee and kept moving. Just walking about gradually increasing the amount and distance and incorporating stairs. At the 3 week follow up appointment my knee was bending very well. The physio was most put out. I'd checked the NICE guidance for efficacy of outcome for physio post knee replacement and found no evidence! At 6 months in the one study, the outcome was exactly the same for physio vs no physio. I also refused opioid medication after the second op and managed fine on paracetamol. Key thing to remember after a knee replacement is that just as you can't bend a hose full of water, you can't bend a swollen knee. Check the Bonesmart website for lots of info from people who have had these ops. Good luck. It really is worth it.