Left hand is basically useless for spiderwrapping. Luckily my trainer is a good guy so he said we’ll try to figure out a good method on Thursday when we are slow. I have full use of my other hand
If it's not a lot, ask for help from softlines. We need the practice for when yet another baby monitor/breast pump/front carrier comes from GS with no spiderwrap.
Edit: What about using your right hand to put on one half roughly correct and then using your left arm to hold that part in place while you get the other side on with your right hand? Then once you have it connected, brace the box with your left arm while winding it up with your right hand?