Figure out what your project involves before you call in a pro. "The more you understand about what they do, the better you can communicate with them and the better you can review their bids," says Zembruski, who uses how-to books, online videos, and magazines like This Old House to get up to speed. Part two of the education process: Ask any candidate for the job to explain how he or she plans to carry it out and which materials will be used. Giving a pro a chance to explain can foster collaboration and, who knows, maybe some creative thinking about how to do it for less. Impatience sends the wrong signal, says Lupberger. "It implies you're not interested in a working relationship."