Next place a row of tiles down along both lines, Make sure to leave room for spacing of the grout. It is a good idea to use grout spacers here. If the thinset comes up between the grout joints, remove it before it dries. Place the ceramic tile into the thinset with a slight downward pressure.
Once you have laid out the ceramic tile, check to make sure that the spacing is ok. You may need to move the tiles some so that you end up with as many full tiles as possible thus avoiding lots of cutting. Take a rubber mallet and lightly tap the tile to assure good coverage. Work in small sections and take your time. Keep an eye on the thin set, if it gets too dry, it may be necessary to add more water and remix.
When cutting the tiles, in a small room in particular, may want to cut tile to fit both sides of the room, giving an equal appearance. Let your eye be the judge. We recommend using a wet-saw for the act of tile cutting as it is likely to snap and break less tiles than other methods, in addition they are available relatively cheaply, for a full list of cutting equipment see: Cut your Tiles.