I tiled my kitchen backsplash a couple weeks ago with 4X4 slate tiles and it looks great. I've sealed the tiles twice and am ready to apply the grout. It's kind of a mortar type looking grout... gray. The problem is.. I'm afraid to do it. I know it's a messy job and maybe that's part of my procrastination. But I'm also afraid I'm going to somehow ruin the tile. Any words of encouragement or tips from grouters out there?