You just need to buy a special drill bit for ceramic and porcelain tiles from any diy or tiling store.
You can also put a piece of insulation tape on the tile to be drilled into before marking the exact mark to be drilled on the tape.
This helps stop chipping to the tile and also helps to stop the drill bit sliding all over the place...!
hi stedders, buy a tile drill bit. These have a flatter /squarer point designed to not crack the tile. Mark the position of the holes, then centre punch the exact centre of hole ( use enough pressure to just make a dent for drill point ) Drill on a slower speed to ensure an accurate hole. i have used a hand cranked drill to avoid slip ups. Always check for hidden pipes as well , very important. I have used the drill bit as a scribing tool too with good results, i hope this helps you to mount your mirror. :)
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