Those are good tips, Marianne, thank you!
Yes, as I practice, I'm moving my arms less. I think it's partly the traveling aspect, moving the quilt forward/back/around, etc. But yes, I do 1 section which takes about 20 mins, then do something else for a bit, then come back to it, and it's going so much better that way (plus with the chair the right height).
Oh, and I use Machingers gloves, but I still have to make myself relax my hands/shoulders; I think this will improve with practice. I hope!