Had both mine done, left knee 2019, right knee 2020. Both done on the NHS, all be it in a BUPA hospital (whittling down NHS waiting lists). The improvement has been life changing, no more pain, off the scale improvement in mobility. As long as you do your physio religiously you'll be fine. Only thing to be careful of is kneeling down. It's something you have to take gradually and get used to. In my surgeon's words "Until you get used to it, it feels like you're kneeling on ball bearings" And he was right but it does get better. Post op I had no pain, just minor discomfort and no driving for 6 weeks. Best of luck.