Tile flooring can be installed by following these basic steps. It is wisest to place tile flooring over a cement floor, and not over a linoleum or former tile surface. One needs to put tile flooring on a clean surface. The concrete floor should then be cleaned with pure water and a mop. If the concrete is very smooth, it is not ready to handle the tile flooring.  Keep in mind that the floor will be 1/2" higher after the installation. You may need to adjust the toilet, vanity, and other fixtures to compensate.