So what is the best technique for cutting square holes in plywood. Some say drill out the corners and then cut to shape. Others say use a forstner bit to hog out the center and then cut to shape. Not sure I see if one is more advantageous over the other. Some even suggested using a chisel to square up the corners.

Additionally, I purchased Bosch Clean Cut blades for my jig saw but the sales rep suggested using metal blades “ more TPI reduces chip out”.

Looking for for advice on how to proceed. Thanks

Dave