Porcelain bathroom tile is a tougher, more finely ground, generally finer alternative to ceramics when it comes to shower tiles. It’s more expensive and harder to work with, but the end result is worth it. When using porcelain in a shower, it is important to start with a properly built mortar shower base and 1/4 inch cement board on the walls, so there is no movement behind the tiles to cause cracks. High-glazed porcelain is nice for the walls, but on the floor uses a low-glazed version to prevent it from getting too slippery when it’s wet.
Use your level to draw two perpendicular lines across the shower floor, cutting into the center. In most cases, the crossing there will be just over the drain. Put your porcelain bathroom tile along the lines, cut in the middle. Use your pencil to mark the form of drainage on the tiles covering it, positioning the curved marks on the tiles about 1/4 inches from the drain itself. Cut curved lines on your wet saw.
Then to use glazed porcelain bathroom tile, spread thinset mortar around the shower drain with your toothbrush. Set cut tiles in place around it. Lay the rest of the floor tiles spread more thinned mortar as needed and using marked lines as guides. Cut pieces at the ends, like shower walls, on your wet saw. Leave the floor tiles set at night. Draw a vertical line in the middle of a shower wall, from top to bottom. Start the tiling at the bottom, spread the mortar and press the tiles into place. Use grout float for the dirt tiles from the top of the walls, work your way down.