A drywall panel installation tool provides engagement for the trailing edge of a drywall panel that is being installed having an internal or external radius curved surface. The tool may include a first flat plate having apertures therein for insertion of the fasteners, a second surface extending from a longitudinal edge of the flat plate and a flange or lip for engaging an edge of the drywall panel, the flange extending from a second longitudinal edge of the flat plate in a direction opposite to that of the extension of the first surface.