For DIYers, installing a storm door is a fairly simple project that is nonetheless easier to accomplish with two people. First, remove and set aside screen or glass panels. Measure the door frame using a tape measure to calculate the height and width of the finished door opening. Using a hacksaw, cut the hinge plate (the long metal section from which the door will hang) so that it is as long as the vertical inside measurement of the door opening. Attach the hinge plate to the storm door with fasteners. Place the storm door in the door opening. Attach the hinge plate side of the storm door to the front of the door casing. Use a level to ensure that the door is vertical. Install the drip cap that goes above the storm door to prevent rain from leaking behind the storm door frame. Run a bead of caulk on the drip cap. Then, using a cordless drill, screw the drip cap into the front of the door casing. Screw the jamb on the other side into place, verify that the door opens and closes correctly, and adjust as necessary. Attach the door closers, handle, and strike plate, and re-install any screen or glass that you removed prior to installation.