LOL!!! That's what impressed me the most too! Haha! I'm not even sure how that's possible, but I hope I never have to find out.
Lol! It wasn't easy but had to get done! Most days I was home alone and no one to ask for help...started by wrapping it around my abdomen backwards so I could clip it ( I could hold one side against my stomach with the bad arm resting on top of it) then spun it around little by little and pulled one side up at a time and slipped over the shoulders.
Around the same time I had a friend that developed frozen shoulder after mastectomy surgery and I taught her how to do the same method