HotRod,
I used to frame houses with my father through when I was going through school. He used to build about 1 house per year as a side job/project/hobby. It was always my job to use the nail gun (my father and his partner would layout the walls and help square everything up), and lets just say I could never follow the studs properly. I used to get chewed out for missing the studs with the nails as the building paper was applied to the walls while is was on the ground.
I was never officially told what nailing pattern to use. I would just throw a bunch of nails into the sheathing. Now that I am on the other side of the coin I know the importance of what I was doing back then.