Abstract: A portable windshield alignment and installation device and method of setting windshields mounts to a windshield wiper post to mark the position of a removed windshield, so that a replacement windshield can be set in the exact same position. The tool comprises a bracket having a base plate, a slide plate, and a face plate. The base plate mounts to a slave post, and the slide plate abuts a replacement windshield. The plates form longitudinal slots. A wiper post panel has an aperture. The aperture enables passage of the windshield wiper post for mounting. A face plate having a stud overlays the slide plate to support the replacement windshield to replace the windshield, and also protect the replacement windshield. The studs align with, and slides through the slots to enable horizontal and vertical adjustments relative to wiper post and replacement windshield.