I agree, just go ahead and get the knees fixed. Don't spend a bunch of money on mobility aids. Find a good orthopedic surgeon who does a LOT of knee replacements, and do exactly what the surgeon and PT people tell you.
If I had known it wasn't going to be any worse than it was, I would have done mine sooner. I won't lie and tell you it's pain free, but it's better than being in pain indefinitely. 6-8 weeks will have you in good shape.
Find a physical therapist and ask what surgeon's patients have the best outcomes. They can give you the real scoop.