This document discusses common mistakes businesses make when managing paid search campaigns themselves and provides recommendations for when to hire a professional. It outlines 10 frequent errors do-it-yourself marketers make, such as only using broad match keywords, targeting the top position without considering budget, and having unrealistic expectations of results. The document advises hiring a professional when the number of decisions required exceeds 60, to avoid wasting money on ineffective campaigns. Overall, it argues that professional management can help optimize paid search and avoid costly mistakes.