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22 years ago when i done my apprentiship i learnt to cut a hole in a tile with 2 hammers. Kneel down on floor and put handle of club hammer between your knees. Rest your tile on the head of the hammer (glaze facing upwards) With a pointed tapping hammer (we had them made) start tapping away gently in the middle of your marked circle. Eventually (quickly when you know how) the glaze will break and you will get through to biscuit. Keep tapping tapping tapping and you will make a hole. Keep going in a circle as hole gets bigger until you can pass a pair of nippers through the hole and continue nipping away. You can do the same method if for example an electrical socket ends up in middle of tile. You can only do this method with ceramic tiles, not porcelain.
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