Removing appliances that are directly wired in your kitchen requires turning the electrical breaker off first. There will be screws in the cabinet holding the range hood in place. Usually there are four of them that are located near the four corners of the over the range hood.

A word of caution, always make sure to cap off the wire with an electrical connector or some black electrical tape once the appliance has been removed. Covering the end of the wire will safeguard against any accidents happening if the breaker gets accidentally turned back on before you reinstall the old hood or mount the new one. read Removing Kitchen Cabinet Range Hood

It’s very important to know the proper way to shut off the water underneath your cabinet before you start the removal process. There is a wrong way and a right way. If you do not turn the water valves off correctly you could end up with a leak. Learning how to avoid getting a leak under your cabinet or in the wall, while removing a sink cabinet or even just working on the plumbing, is important. read Sink Cabinet Water Shutoffs