On a couple of occasions customers have asked: “can I direct wire the microwave.” I can’t remember what the cabinet installation situation was that caused them to ask but one time the question warranted a call to the appliance manufacture to get an answer to the question.
read Never Direct Wire an Over the Range Microwave

When you are installing cabinets that have plastic laminate on them, the process of cutting the Formica, when scribing to fit, can be done with a skill saw. The trick to this is using the circular saw in a reverse motion when making the cut on the finished side. What I mean is that rather than pushing the circular saw forward so that the rotation of the blade is pulling the finish side of the laminate up and causing it to chip, you kerf the laminate running the skill saw in a reverse motion. The first pass of this saw kerf should only be about an eight of an inch deep. Make sure that you practice this technique several times on a scrap piece of wood before actually doing it on the cabinet. Use the following steps as a guide. read Cutting Formica with A Circular/Skill Saw