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Asking the following questions will help you to decide which Disc Jockey you're most confident with:

How much experience does the D.J. have?
Does the D.J. have a professional/proper appearance?
Does the D.J. have a tentative format as to what order the events of the reception should occur?
What kind of sound and lighting does the D.J. carry?
Will dinner music be included in the D.J.'s price?
Will the D.J. set-up before your guests arrive free-of-charge?
Do you feel confident with the way the D.J. presents himself/herself?
Will the D.J. meet with you personally before your wedding date?