X-ACTO knife for me. I learned using razor blades too. The kind without the 'safe' edge. Then went to the 'safe' edged ones. I have a small black plastic ribbed cover that fits over the 'safe' edge for easy gripping. No idea where I got that from. But my favorite is the X-ACTO knife. It is comfortable to hold onto and my fingers or hand never cramp no matter how much ripping I am doing.