Hi Anne,
Sounds like you'll need lots of support from family and friends. My adoptive brother is having a hip replacement after football season is over. He operates all the aquatic equipment for the Buffalo Bills. I guess next spring, after the Superbowl, he'll have that done. A neighborhood lady had both knees done at once; she did okay. But I think you're wise in doing one at a time.
I've added you and Steve to my prayer list! Blessings...