Cement backer board is a DIYer's friend—it will let you lay down tile without using a thick bed of mortar. But you'll need to cut it down to size, and here's how.

The 1/2-in. thick cement board spans studs spaced 16 in. on center. Other sizes, like 3 x 4 ft., 3 x 6 ft. and 4 x 4 ft., are available, but you may have to contact a tile supplier to find them.

Avoid cutting the board with power tools when indoors. Clean up any dust and debris with a damp sponge or towel. Step 9: Use a carton knife to score and break a new piece of cement board to fit ...