Make sure you stand over your fabric while your cutting. Not having it the right height for you can effect how you cut. They have finger guards that you can get to put on your ruler. I've even seen some people put on safety gloves. If you make sure and keep your pinky finger on the mat as you hold your ruler straight that helps with slippage. It also helps if you get one with a squeeze handle that way the blade isn't out until you are ready to cut. The rotary cutter is a wonderful tool as long as you respect its personal space. =) Good Luck!