Just stand on the box in your unnatural stance for a while, do some hops and switchups just standing still like that. Then think the whole line through in your head, visualizing your successful stomping of the unnatural slide. When you can picture it all the way through, send it! focus on your breathing too, that will help you stay calm. Try to exhale as you pop ( practice this going your natural way to line it up). The human body is more balanced when exhaling, hence why people generally exhale when shooting a gun.