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Start at the hinge side, get it vertical with shims, and pin it. Then
using the closed door as a guide, shim and pin the latch side. Once you
have a warm fuzzy that the door operates properly, install the rest of
the fasteners, stopping frequently to make sure door still works
smoothly. Be careful not to over-tighten any screws. Then install the
remaining trim to cover the shims. By the 3rd door or so, you will have
the hang of it. Hanging pre-hung doors is the first thing they stuck me
on as a kid, once they took me off sweeping duty, because it is so easy.


I was much older when I did my first...three children, one of whom
knocked the door down trying to get to a sibling. Just a normal
squabble, but the door was not fastened in place other than by the
finishing nails holding the trim in place!! There are many ways to
learn how NOT to do things )