Here’s the golden rule: always cut away from your body. Not toward your hand, not toward your stomach, not toward your pet hamster named Sir Fuzzypants.
I know it sounds obvious, but in the heat of a cardboard-bashing moment, we all get bold. Don’t. Be lazy about safety. Use a ruler as a barrier, and keep your fingers behind the cutting line.
If you’re still nervous, wear a cut-resistant glove. They’re cheap and make you look like a culinary ninja. Totally worth it.