Detailed installation instructions will be included with the particular door you choose. Bypass (sliding) patio doors are space-saving alternatives to swinging doors. Upgrade Your Old Patio Door with Great New Privacy Features. How to Install a Sliding Patio Door. Now that the door is structurally complete, you can install the locking mechanism per the manufacturer’s instructions, as well as any shades, blinds or grills that may have come with the door. Therma-Tru offers easy-to-follow instructions and downloadable PDF print guides to ensure that the process of installing your Therma-Tru entry or patio door is as easy and stress-free as choosing the door. Vinyl Sliding Patio Door Installation Instructions.