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Deck stairs look simple until you cut your first stringer wrong. I have done that, and one bad cut can waste a whole board. Building deck stairs is one of the most useful DIY projects you can take on.

Dear James: My old wood deck is deteriorating, and the stairs could be hazardous. What is the easiest way to install new ones for an inexperienced DIY-er?—Shantell K. Dear Shantell: You are correct to ...