I have never cut tile myself, but i once watched a guy doing it and he put masking tape on the cut mark. He put the mark on the tape and cut thru the tape. I think the purpose was to reinforce the tile, but I'm not sure. Maybe he was just making it easier to see the mark. But why not try it. Grab some scrap tiles and give it a shot. The blade will cut thru the tape easily. so it cant hurt to try.