To build and install your own patio cover, start by determining the type of cover you want and the materials you'll need. Research patio cover companies to gather ideas and understand design options. Next, create a detailed plan including measurements, materials list, and structural considerations. Depending on your skill level and the complexity of the design, you may want to consult with a professional or hire a contractor for certain aspects of the project. Once you have your plan in place, acquire the necessary permits and permissions from local authorities.