Trombone stroke rehab

Just bought one from eBay. Its another part of preventing my descent into dementia. I played trombone in high school, wasn't very good at it. When I was a senior I was 2nd trombone, a freshman was first.  I never did learn how to read notes, what was a B,C,F, I learned that this note on this staff line was this opening of the slide. And since holding the trombone to my mouth will require my left arm and hand to cooperate and shut down the spasticity that prevents me from reaching my mouth with my left hand. Or I'll just bungee cord my wrist to my neck.  This will be frustrating as hell but eventually good for me.  13 years ago I took up the saxophone, loved playing it, but was not very good. I have my alto sax here but since I can't keep my left hand open I haven't been able to play it. My tenor sax is now my daughters, she played it in high school.