Before installing a garbage disposer, make sure your has sink has a normal, full-size drain opening and that you have plenty of room in the cabinet below. To power the new disposer, you should run a dedicated circuit from the breaker panel. If this is not possible, tie into another circuit that you have access to. When shopping for garbage disposers, you will have various options for you to choose from, such as horsepower, reversing capabilities and insulation for noise reduction. Choose the system that meets your needs.