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Don't make the mistake of hiring a real estate agent just because she's a friend or family member. Do your research to find the most qualified person for the job.

While it may be tempting to hire your old friend from college or your cousin who just got his real estate license, you should only hire him if he's truly the best person for the job.

"If you're going to use a Realtor, it's extremely important that you use a qualified one, particularly if you don't have a lot of experience," Hahn says. "I would be very leery of going with someone who's a rookie because the bar to entry in the real estate profession is very low."

Look for a full-time, full-service agent with several years of experience. Find out what professional designations they hold.

"The more advanced education the better," Hahn says. "Not only do they know more, it's a sign of their commitment to their profession."

A well-seasoned agent also has built an extensive network of contacts and can put together a team of professionals who can help with your purchase or sale, including other agents, mortgage brokers, contractors, appraisers, title companies and the like.

• Get tips on shopping for a Realtor

• Learn how to choose a great listing agent

• Take the stress out of buying and selling with tips from our Drama-Free Real Estate Guide

NEXT: #8: Find the experts in the neighborhoods you want to live in >>