Put on your safety glasses. Although the stone tile is strong and unlikely to break, it's best to take precautions. A snapped tile could send pieces flying.
Lay the sheet of tiles on your work surface with the mesh side down. Slide the sheet so one row of tiles hangs loose off the edge of your work surface.
Hold the sheet against your work surface with one hand to keep it still. With the other hand, peel one tile at a time away from the mesh and set the tile in a storage container. As you finish with a row, slide the sheet along the work surface to begin on the next row.
Lay your tile sheet, mesh side down, on a baking sheet. Pour enough warm water into the sheet to cover the layer of mesh.
Let the tile sheet soak 10 to 15 minutes. This will dissolve some of the glue on the backing. Leaving the sheet in the water, remove the tiles one by one from the backing.
Rinse and dry the tiles. Keep them in a storage container until you're ready to use them.