For soldiers and others who carry a lot on their shoulders it is a common thing to have a hunchback or rolled forward shoulders. To relax this tension place your forearm parallel to the ground on your back and rotate your shoulder back and forth while you breath with the movement. Than place your hands on the wall facing away from it and walk from side to side using your arms and than up and down a few times. This can of course be done with a partner too. Notice your posture as you stand doing delicate work. Relax it and you will find the work better and easier.