Trying to cut porcelain tiles yourself isn't nearly as daunting as it might seem. Whilst porcelain can be fragile, any DIYer can easily manage the task of cutting them neatly. The secret lies in the cutting equipment you use. With the right cutter, you'll be able to cut any porcelain tile like a pro.
What You'll Need:
Manual tile cutter
Pencil
Tape measure
Porcelain tile
Step 1: Set Up Your Workspace Find a safe area to work on cutting your tiles. The space needs to be large enough to hold all your cutting equipment and your tiles, whilst also giving you plenty of room to move around freely.
Step 2: Take Your Measurements Use your tape measure to measure the exact area on the tile where the cut needs to be made. Mark this with a pencil to ensure you make accurate cuts.
Step 3: Start Cutting Place the tile on the manual cutter. To stop it from slipping or moving while you cut, push it firmly against the cutting guide (or tile stop).
Score the tile by gently pushing the cutter handle across it. This will create a small score line on the surface of the tile. Once scored, apply firm pressure to the cutter handle to snap the tile along the line and complete the cut.
You don't need to apply excessive force to cut porcelain tiles neatly. A medium amount of pressure is all you need for a perfectly clean break.
Source: www.DoItYourself.com