I had a BTKR nine years ago, and I was 80% excited to be losing a painful and restrictive lifestyle---the other 20% of the time I was nervous. I can tell you that, in looking back, I would have done it the same way again. One pre-op, one surgery, one hospital stay, and one recovery.
My recovery took some time---and you need to be patient and realize that your knees will set up the schedule for recovery---anything you think you should be doing---either too fast or too slowly--is entirely up to the knees.