If you had written this only last week, I would have said "Noooooooo, don't do it." And here I am only four weeks out of surgery and beginning to feel somewhat normal, so now I'll say "Go for it. It will be ok."
You will be surprised at just how little the pain is. Those bionic implants are not feeling a thing. It's the muscle, tendons and nerves that complain. I've had very little sharp pain. In general, it's the achy feeling in my legs that keep me up at night. I couldn't believe how easy it was to stand, walk and climb stairs the day after surgery.
Just a few suggestions:
1. Be sure you have a comfortable place to sit, and that it is higher than a regular chair. My husband took a cushion from another part of the couch and placed it where I generally sit. The extra height makes it easy to get up and down.
2. Definitely get a commode, preferably one with handles on the side. After surgery, you will realize just how low our toilet seats are.
3. Get a little bag to hold essentials--medication, water, cell phone, reading material, etc. I brought this with me to keep by my bed at night.
4. Take an ice pack with you when you go to bed at night. If you waken during the night, and you probably will, you can ice your knees and they will feel a lot better.
I would be lying if I said it was easy; it's not. But I'm guessing it will not be as bad as you imagine. I don't think that at any time during this process, my pain level even approached a 10. On my worst days, I was probably at a 5, but mostly I would put the aches at about a 2 or 3. When you're trying to sleep, though, an achy 2 can make it difficult.
Follow the great advice of the experts here. Keep your legs elevated; keep them iced; and take your medication.
And the really good news is that once this is over, it is totally over. No need to go back and do it again.

I honestly believe that bilateral is the only way to go.
Hang in there. It will be ok.
