My husband had total knee replacement at age 35 due to college football injuries. I can give you some advice from my experience being his caretaker.
1. If you are going to have a continuous passive motion device (CPM) at home, go to the Dollar Tree and get some of the rubber shelf liner. This will keep the machine from sliding around in your bed.
2. Take your pain medication as prescribed. If it says every 4-6 hours take it at 4 hours. If you stay ahead of the pain, you will be far better off. It is hard to get the meds to 'catch up'.
3. Eat with those pain meds or your stomach will be a mess. Also, drink lots of water.
4. A stool softener is always a good idea when on narcotic pain meds.
5. Do NOT be embarassed to ask for help. If a friend or family asks what they can do for you, send them out for milk, ask them to run the vaccuum, see if they can toss something in the oven for your family. Take the help. You can return a favor later.
6. Work hard at physical therapy. The harder your work, the faster you will recover.
7. If you can buy a shower chair. It makes getting in and out a bit easier and you can rest in there.
8. If you have a low sitting toilet, see about getting a riser. It will be easier to get up right after the surgery once you are home.
Try to relax. My husband was all kinds of wound up for weeks before his surgery. It's a big deal, but you will be so much better off. He is thankful he did it everyday since. Yes, even including the days immediately following surgery.
Take a deep breath, clean the house, get some food prepared ahead of time and love your family. My husband went up and down a flight of basement stairs 11 day post knee replacement. He says it changed his life.