If you can park on a grade the mast stands on its own while you jump down to secure the forestay. Notice the backwards Prindle 18 in the background.

I've got shoulder issues as well and this way is not a problem for me. It works well whether the mast is rotated or normal. You do have to watch out that the diamond wire doesn't shear off your ear as you lift it past your head. Don't ask me how I know....