Commence by implementing the thinset/mortar using the suggested trowel notch sizing for your tile you buy. Unfold it out evenly to the back again in the tile. Use the trowel notches to stage out the thinset, making certain the lines go in exactly the same way. Striking geometric tile helps https://lanelnmmo.webbuzzfeed.com/37114674/the-definitive-guide-to-bathroom-tiling