Just squeeze the OXO Snap-Lock Can Opener until you hear the lock snap and it will hold securely in place while you turn the knob. There's no need to grip tightly to keep the can opener in place on the rim. Press the lock open button with your thumb and it springs open to release the can. The curved plastic handles are broad and rounded to distribute the pressure evenly as you squeeze. The oversized knob makes turning easy and comfortable.