I have a question for you about stairs. I know about a month in to my left knee I tried stairs with my surgical knee and though it wasn't too bad at the time, I felt it the next day and was advised to put it off for awhile. But when you have a bilateral, you don't have that option. So how did you handle stairs.
Sorry for the delay in answering. It was a busy holiday. As for stairs... yes, that's the situation with bilateral replacements: you have two surgical knees. But here's the deal with that -- they're both good, strong (albeit surgical) knees! So early in recovery there's the pain to deal with, and the fact they don't bend especially well at first. But that's it.
I used a cane at first. And my right knee was my "better" knee (stronger because not as bad off pre-op so I used it more, less painful, and also that is my dominant side) so I used it the way single TKR patients use their non-op knee. It worked perfectly well. There was pain, but not necessarily any worse than for single TKRs. For many people with a "good" non-surgical knee, that knee really isn't all that good. It may have advanced, even bone on bone, arthritis. A bone-on-bone arthritic knee is very painful. I can speak from experience that my surgical knees were no more painful than bone-on-bone arthritis. So...
Stairs were not a problem. Going up and down the stairs was slow going at first, but not impossible and not much more painful than before surgery. I could do stairs "normally" on the same timeline as single TKRs.
Your knee will tell you when it's okay with going foot over foot on the stairs. If it swells, that's your signal to wait another week before trying again. The height of your steps enters into it. Tall steps stay difficult for longer; I only recently (last few months) am able to easily go normally up my front steps, which are quite high. It takes time and just doing the steps to build up muscles weakened by years of accommodations made because of bad knees.