To find a good coin appraiser, use the directory of the Professional Numismatists Guild. This group has strict guidelines of how appraisers should act, making its directory a must-use resource for those seeking accurate and honest appraisals.
If there is not a PNG appraiser in the area, use the directory from the American Numismatic Association, which is a similar organization with less rigid standards. If there are no ANA or PNG appraisers in the area, go to coin shows to find a dealer.
Before choosing a coin appraiser or a dealer, find out if he is trustworthy by asking for references and learning how much experience he has in the field.