Measure the height to the ceiling from the floor.
Add the thickness of the drywall (usually either 1/2 inch or 5/8 inch) plus 1 1/2 inches for the actual thickness of a 2-by-4. Subtract that figure from your ceiling measurement.
Measure, mark and cut one 2-by-4 to that length.
Cut the other 2-by-4 to 3 feet 6 inches.
Nail the shorter piece of 2-by-4 vertically to the end of the longer one so that the two pieces make a T.
With the dead man lift leaning toward you, place one end of the dry wall on the cross piece and lift the sheet into place on the ceiling. The dead man lift will hold one end while you hold and fasten the other end.