When cutting plywood, you'll want to use two hands to hold the saw firmly in place. Be sure that your fingers are out of the way behind the shoe of your circular saw. Keep one foot on the baseplate and push down with it as you cut to provide extra stability. When beginning a cut, let up slightly on the trigger and be sure the blade is spinning in the right direction. Then, apply moderate pressure to make your through-cut. Slowly ease up on the foot that's pressing down on the baseplate, while more firmly applying pressure with your other foot.