When I first switched to dressage, I did a lot of stirrupless work, especially at the walk during warm up. I focused on stretching my legs and sitting as deep as possible. When we started at the trot and I picked up my stirrups, they didn't feel quite so long. I also only dropped my stirrups about one half hole a week to get used to them. But, now I'm back to hunters and oh so happy to have my stirrups jacked back up! LOL!
I've spent most of my life riding horses. The rest I've just wasted.