Install the First Few Tiles
Using a notched trowel, spread mortar over the area of the first few rows, leaving room to work and to see any grid marks. Spread mortar with the flat side of the trowel and then use the notched edge of the trowel, at a 45-degree angle, to create wide grooves in the mortar. Position tiles, adding spacers between. Press the tiles into the mortar.
Place a straight board over the tile and adjoining tiles and lightly tap with a mallet to level the tiles with each other. Again cut tiles as necessary using a tile cutter or wet saw. If needed, use tile nippers to make intricate cuts for areas around obstacles. Imbed transition strips into the mortar at doorways as doorways are reached in the process of tiling the hallway.