Round the inside corner cuts. Even though the flange of the sink shown here will cover the inside corners in the sink cutout, take care to make a gentle rounded corner cut by drilling at the corner with a 1⁄2" masonry bit. Perpendicular corner cuts can lead to cracking. Finish the straight legs of the cutout with a tile saw or a jigsaw with a masonry blade.
Start laying tiles. Use modified thinset and a 1⁄4" trowel. If you have an inside corner in your countertop, begin there. Apply thin set at the inside corner, enough to place four or five tiles. Set the left and right inside corner pieces and the first 12 × 12 field tile.
Continue setting tiles. Apply the thin set mortar to an area big enough for two to four tiles and place the tiles. Use a 2 × 4 covered with carpeting to set the tiles. Push down on tiles to set, and also across the edges to ensure an even face.
Apply grout and seal. After the thin set has dried for at least 24 hours, grout with an unsanded grout. When the grout has dried, seal with natural stone sealer.
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