I found two PT guys who put out a bunch of short videos on how to do heel slides and the like. They were wryly funny and made the whole process seem do-able.
Are these the 2 PT's that call themselves the most famous PTs on the Internet? I can't remember their names, but I did watch a number of their videos.
Yesterday I was at the bottom of a deep pit. I felt like I wasn't handling the recovery well; that I should be "sucking it up" more; plus, a return of the worries that I needed to be exercising madly--where did I put those charts?!? It was a whiny, horrible day, where the mild discomfort of a recovering knee was just too much.
I am sorry to hear that you were having such a difficult time. I can certainly relate! As a matter of fact, I have quite the collection of t-shirts as a result if you are interested.

(ref: been there, done that, bought the t-shirt) Given all that you have gone through, I won't even charge you for shipping and handling. No need for additional stressors.

I don't know that I could handle having staged TKRs, so kudos to you for doing so well. I would say that you are more than entitled to some down days, not that I would wish them on you or anyone else. There is nothing that you need to be sucking up more! Come, relax, vent, scream, holler, yell, have a tantrum, whatever helps! We are here for you, and we get it! Oh, and try some ice cream. It is the wonder cure for everything, including down moods, bothersome knees, sore throats, etc!
