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The two pieces will need to be joined together with a 1" lap joint. Clamp a straight-edge to the plywood and make several passes with a circular saw set to about half the depth of the plywood. Follow up with a chisel to make a smooth surface. Use construction adhesive and screws to attach the two pieces together as well as to the cabinets.
Use cardboard to template around the Counter-Seal®. Lay out the tiles, leaving the desired amount of spacing between them and tape the seams of the tiles so they do not move. If you do not have tile spacers, you can use coins. Set the template on the tiles and tape it down. Trace along the template and number the tiles with a grease pencil.
Remove the tape and cut the tiles with a wet saw. To mimic the factory edge on the cut tiles, use a variable speed angle grinder to buff the edges. Back-butter the tiles around the sink with a square-notched trowel and set them in place.