Hanging exterior doors is harder than it looks. The supply crew comes by and drops off one door per house at 1 pm. We have to hang them all by quitting time (2:30) so they won't be stolen. When we attempt to plumb them, the trim splits. The next day, we find out that we shouldn't have secured them by the trim, as the trim is being replaced. We compensate for our inexperience by using extra nails. I'm not sure that helps.