[header] How to replace a garbage disposal [title] Turn off the power to the garbage disposal. [step] Head to your home's main circuit breaker and find the switch corresponding to the garbage disposal unit. Flip the switch to the " off " position. 
You'll now be able to work safely without worrying about accidentally receiving a nasty shock. [substeps] Garbage disposals are electrical appliances, which means there's a live current running through them at all time while the power is on.