Check that the door jamb on the hinge side is plumb and shim as necessary.
How to put a door back on hinges by yourself.
Trim any exposed shims by scoring them with a knife and then breaking along the line.
Drive 6 finishing nails through the trim and into the studs behind the wall spacing the nails about 16 inches apart.
Lay the old door back on top of the new one and then transfer your hinge mortise lock set mortises and door hole outlines.
Use a combination square to lay out the mortises making sure that you re transferring the proper width and height of the outlines.
The depth of the hinge on the jam should always be as thick as the hinge is.
Temporarily screw the hinge jamb in place by driving two 8 3 inch drywall screws through it.
Line the hinges up with those holes and use a hand drive screwdriver to attach them.
Double check to make sure that your outlines match the same location on the door and jamb before moving to the next step.
Push a hinge pin into whichever hinge lines up first then tap in the remaining pins.
Loosen the screws if necessary to bring the jamb back into plumb.
Grab the door with both hands.
Why would you need to re hang a door.
Install door trim nail the trim to the jamb and studs.
Put your hinge in place on the door and the jamb and use a carpenters pencil to carefully trace around the hinge.
Move the door and the sawhorse together into position so that the hinges align with the hinge mortises on the jamb.
Swing the hinges open on the door.
Score the outer edges.
Trace around the hinge.
Well sometimes you need to take it of.
One about 2 inches above the top hinge and the other about 2 inches from the center hinge.
With the weight of the door hanging on the top hinge work the other hinges together.