To replace a cracked tile, start by using a masonry or carbide-tip bit to drill a hole (any size) in the center of the damaged tile. With a glass cutter, score the tile diagonally from each corner to the center hole. Then, using a hammer and a cold chisel, chip away pieces of the tile, starting at the center and working out to the edges.
Sometimes when you’re replacing a wall tile, it will slide out of position before the glue dries. If you expect that this may be a problem, you can prevent it by putting small shims - wooden matchsticks or toothpicks - in the space under the tile to support it. Leave the tile like that overnight or until the mastic dries. Then you can regrout around it.

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