Put on leather work gloves and safety goggles for protection while repairing the tiles. Place a wood strip underneath the lower half of the tile directly above the damaged tile, to act as a wedge.
Remove the nails from the damaged tile, using a pry bar. Use a hammer to break the damaged tile into several pieces. Do not hit any of the surrounding tiles.
Remove the tile pieces from the area. Attach one end of a tile clip to the roof support.
Attach the other end of the tile clip to the underside of the replacement barrel tile. Lay the replacement tile in place with the upper part of the replacement tile slightly beneath the tile directly above.
Shave the edges of the replacement tile with a wet saw if it is stressing the adjacent tiles. Repeat the entire process for each damaged barrel tile on the roof.