Shaving a slither off a tile. All was going well with tiling my kitchen, but I've found that 2 tiles are too deep by 2mm. These tiles are on the window cill and due to a tiny lip at the base of the window it means that these tiles sit forward just enough so that the tiling edge trim will sit proud by the thickness of the trim. Whats the best way to trim the tile down to allow the tile to sit correctly? I've got a carbride file and was intending to sit there and keep filing it down until I achieve the right depth of tile. Nippers would probably mean taking too much off and scoring will likely not work well either.