This is a bear to assemble and install, but once up, it's amazing. I had to use a 1x4 painted the color of the wall to install the track because of the existing door frame; it's that piece of wood we attached to studs (requiring extra screws) before mounting the rail to it. Be sure you measure very carefully so that the bottom of the door hits the guide. It helps when your son is an engineer and the project manager. :)