micky wrote:
starting a cut in the middle with a sabre saw?

Do people really do "plunge cuts" with sabre saws. That is, start
holes int he middle of plywood, or fibreboard?

Or do they just drill a hole first.

I've used an angleing technique, holding the saw with the blade teeth just
scrapeing the wood, then gradually rotating the saw so the blade cuts deeper and
deeper into the wood till it finally breaks through.