Welcome to Tradgang! I learned to shoot left-handed a few years ago just because I wanted to have the choice. It is awkward for the first few weeks, but most people seem to figure it out without much more trouble than that. It is a lot easier than learning to write left-handed would be. There really aren’t any complicated moves that the hands have to make. I recommend you spend the time to do it, and then after you get used to shooting left handed, practice both right and left handed. It’s the best thing you could do for your shoulders.