Many people choose to fit their own bathroom tiles and this is usually a job well within the capabilities of most DIYers. Plain, standard-shaped ceramic tiles tend to be the easiest type of tiles to fit, closely followed by porcelain, although these are a little heavier and harder to cut.
If you have opted for large-format tiles, particularly those that are made from natural stone, it really will be worth the extra cost to call in the services of a tiler. Stone tiles can be really heavy to handle and position, are prone to staining if not properly sealed and any mistakes will be very expensive to rectify.