Best wishes for a good recovery, Jim.
Several have urged you to do the physical therapy. That will be the biggest factor in a good recovery. I had a total knee replacement five years ago, and did all the P.T. prescribed, more frequently and for longer than prescribed. As a result, I have a pain free knee with 98% of the natural rotation and bend. I'm 74 and can climb up on my railroad layout with no difficulty, when I need to. You can do this, too.
Embrace the pain, and later be delighted with the result. Best wishes to you.