Installing a garbage disposal typically requires several steps. First, the appropriate size and type of disposal must be selected based on the homeowner's needs and plumbing system. Next, the sink must be cleared and the existing drain flange removed. The disposal is then mounted and connected to the drain and electrical supply, and the plumbing is tested to ensure proper function. While some homeowners may be able to install a disposal themselves, it's often best to hire a professional plumber to ensure safe and proper installation.