Hi Jason, the only ones i have seen hang from a belt on your waist with a loop/tunnel for your belt to go through. It seems to me that hanging it over your should would get in the way plus wear your shoulder out. Having said i have never used one either so i may be wrong. If you pad it i would use some neorpine and put a piece of suede over that to help with it sliding off. As far as softing it up you might try pulling it down across you leg.
Take a compass, divider or a pencil and mark light lines and you will have a guide line to start your tooling from. I try to start in the middle and work out to either side.