You'll do fine without PT. Many of us never took formal PT or did exercises. I am one of them. I had 11 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. As I healed I was able to do more. Icing and elevation was a huge part of my recovery.
Listen to your knee. It will tell you if you're doing too much by increased 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.