Pro tip: if you use a jig saw, cover the ENTIRE cabinet side with blue painter's tape, and lay out your lines in super-fine black Sharpie on it. You have no marker lines to clean up later, and the tape protects the finish on the cabinet from the metal chips that get under the saw's footplate.
Carefully deburr the cut edges with a used flap wheel grinding wheel (less aggressive than a new one, even fine-grit).
That said, we have a waterjet at work, so I usually cut out my panel covers with it, unless it's a crazy-short turnaround project and I don't have time to do the layout drawings.
-rpoet