Ordinary citizen Bernard Goetz,on a NYC subway traincar(a tight space),managed to shoot FOUR young thugs (armed with screwdrivers)who tried to rob him,and didn't hit a single bystander. NYC doesn't have much in the way of gun ranges where people can go practice,and handguns aren't allowed there anyways. So it's reasonably safe to say that Goetz was NOT "well-trained",yet didn't "spray bullets" or harm any innocents. Clearly self-defense is not as tricky as some people would have us believe.
the fears of armed citizens hitting bystanders is unsupported by any evidence. it simply has not happened,in decades of armed carry by ODCs.