Good luck, my first, on my left knee, was 25 years ago now. and other than the normal aching, especially in cold and wet weather, it's ok. My second one I had done on my right, three years ago, isn't up to par, IMO. Plus, the recovery was much, much worse because now they use a tourniquet above the knee, on the thigh, which hurt a lot more, and longer, than the knee itself. I was black and blue from one side of my butt to my foot. It was an ordeal, let me tell ya.
Apparently it allows them to use less blood, but had I realized I would have opted out.