Firmly hold the masonry chisel to the grout joint between two brick tiles.
Tap the head of the chisel with the masonry hammer to chip away at the grout joint, until the grout is completely removed from between the brick tiles.
Angle the chisel (at about 45 degrees) to the joint between the brick tile and the mounting surface (floor or wall), and hold firmly.
Strike the head of the chisel with the masonry hammer until the brick tile breaks free; in most cases, removing brick tile will result in broken tiles.
Repeat the process on the remaining brick tiles, working your way outward from the first brick tile removed.
Remove any remaining mortar from the mounting surface, using the masonry chisel and hammer.