Disposals are one of the more common appliances to break or need to be replaced in the kitchen. Other than clogs or jams it is typically cheaper to replace a broken disposal than to repair it.
Replacing a disposal is a job that takes multiple skills. It requires basic knowledge of electrical work to disconnect the old and reconnect the new disposal. Replacing a disposal also requires knowledge of plumbing. Often waste lines will need to be moved or replaced when changing a disposal. In addition, mounting the disposal requires a great deal of strength and Technique, this can be a challenge for the inexperienced.