Depending on where they are and how they're installed, removing ceramic tiles can be either a nightmare process or a relatively simple job requiring very little effort. As well, removing all the ceramic tiles from a wall or floor rather than just trying to remove one or a small number will be easier simply because you're not worrying about damaging the surrounding tiles. Here are some ideas on how to remove ceramic tiles in a number of different situations.
Ceramic wall tiles on cement board or Gyproc