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I'm an inexperienced/novice tiler. I've only done a couple small jobs at home. I'm tile a backsplash for my kitchen with 4x10 ceramic matte tiles. The kitchen area is "U" shaped so the lines will continue on the side walls. I just noticed that my window sill is uneven. It's about 1/2 inch off. The window itself is level. I'm concerned with breaking the granite if I try to remove it. Any suggestions?