Installing Doors and Windows with Tom Law. Everyone wants trouble-free doors and windows - doors that swing smoothly without rubbing or slouching, windows that open easily and keep cold air out. Master Tom Law has installed thousands of doors and windows, developing the time-honored techniques that mark him as a master carpenter. How to Install Windows and Doors. Whether you just want to add some light to a room or need to hang doors and windows on a job site, you'll find Law's methods and trade secrets invaluable. And Law doesn't ignore problems. In one part of the video, he intentionally creates a door-hanger's nightmare, then shows you how to save the installation. By watching learn video you'll learn how to: square up and secure an opening window in minutes, set and seal an insulated glass unit in a custom-built frame, shim and plumb a prehung exterior door so it won't sag, size an interior door blank to fit within a site-built frame, make a simple template to align and rout hinge mortises. Windows & Doors: Installing, Repairing, Replacing.