Hi, Kathy! You are doing great! I started driving 3 1/2 weeks post RTKR after driving around the block a few times with my teenage son riding shotgun just in case. It felt good to be able to drive to the local supermarket and pick up my own prescriptions at the same place. My store has nice ride-in electric carts, which I used. But WALKING across the parking lot and into the store, then back to the car- was super exhausting. You may encounter similar, so keep your early "out & abouts" short and to the point.
This time around I did not begin any sort of formal PT until 6 weeks post op, and am progressing better and in much more comfort vs. my first TKR, where I started PT right away.