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Dry-fit the tiles to determine the best layout. Avoid layouts that have very small pieces of tile at one end. Think about which part of the room is seen first, and give that part of the room the most attractive layout. Once the layout is determined, set the tiles aside.
Use a drill with a paddle bit to mix thinset tile adhesive according to the package instructions. The adhesive should be about the consistency of cake frosting.
Use a 1/4" x 1/4" square-notched trowel to spread thinset in the area to be tiled. Spread out the thinset, then use the notched edge to create ridges in the tile. These air pockets help the thinset to dry and also create suction to better adhere the tile to the floor.
Set the tiles in the thinset evenly, using tile spacers to get an even grout line. The width of the grout line is a matter of personal preference; larger tiles usually look better with larger grout lines.
Continue spreading thinset and setting tiles, using a wet saw to cut tiles as needed. If taking a break to cut tiles, scrape up any thinset from the work space so that it doesn't dry out. To check for dryness, gently press a finger into the thinset. If it's too dry to stick to your finger, it's too dry to adhere a tile.
Once all the tile is set, let the thinset cure completely before grouting. Remember to remove the tile spacers before starting to apply grout.