You can use a board door lifter to make this easier.
How to hang interior door hinges.
Don t fill the hinge up with all the screws yet in case it needs adjusting unless you are hanging a heavy fire check door.
Keep the door in an open position so you can attach the hinges to the door frame.
Connect the door to the jamb.
Slide the hinge pins into place and remove the blocks from the door.
Slide wedges or shims underneath the door so the hinges line up with the mortises on the frame.
Mortise the hinge openings using a chisel and utility knife photo 4.
Once you ve finished mortising the hinges set the door upright and bore the lockset holes.
If the old door was trimmed at the bottom and you were happy with the gap at the floor cut the new door to match.
Use a centering punch to make starting divots for the screws.
Mount the hinges on the new door and hang the door.
Repeat on the other two hinges.
Hold the door in place using blocks under the bottom to support it if necessary.
If the door is heavy have a partner help you hold it in place.
Screw the hinge leaf to the door.
While replacing an interior door in an existing opening doesn t require many tools it does require patience and care.
Position one half of a hinge with the inner knuckles in its mortise on the door.
Lift the internal door out of the clamp offer it up to the frame at a slight angle and screw the top hinge to the lining first.