I'm one of those who never took formal PT. Due to birth defects, I've had 12 knee surgeries, 2 of them kneecap removals, and 1 TKR. Even after those, I never took formal PT. But, I didn't just sit around and do nothing, I used my knee as it was intended to be used by walking around to take care of my daily needs along with the necessary house and yard work. As I healed, I was able to do more. Icing and elevation were a huge part of my recovery.
Listen to your knee. It will tell you if you're doing too much by increasing pain and swelling. When that happened to me, I found that resting, icing, and elevating helped. Your knee knows how to rehab itself without being told what to do. Doing too much too soon causes setbacks because your knee has to heal from the inflammation caused by the exercises before it can get back to its normal, after-surgery healing.
Listen to your knee. It will tell you if you're doing too much by increasing pain and swelling. When that happened to me, I found that resting, icing, and elevating helped. Your knee knows how to rehab itself without being told what to do. Doing too much too soon causes setbacks because your knee has to heal from the inflammation caused by the exercises before it can get back to its normal, after-surgery healing.