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How to cut tile
Purchase a tile cutter that's wider than your tiles.
If you are laying a diagonal pattern and have to do diagonal cuts, measure the size of the tile from corner to corner and buy a tile cutter that is wider than that. It should also have a rotating guide that allows you to make cuts at different angles.
Practice using the tile cutter with some scrap tile or less expensive pieces. Use a pencil to make a tick mark on both sides of the glazed side of the tile, where the cut begins and ends.