Here’s what most people use to cut a sheet of plywood: a circular saw, a couple of 2-by-4s and a pair of sawhorses.
The problem with cutting it like that is once you snap your chalk line and go to make your cut, the plywood has a tendency to sag in the middle. This will pinch the sawblade and create a dangerous kickback.
Instead, use four 2x4s, with two of them on either side of the cutline. This will support the sheet better as you make your cut.
Then, when you make the cut, there will be no chance of sagging and pinching the blade.
Watch the video for details.
