It makes much sense to hire an attorney in your case.  Look for the attorney who do nothing but represent traffic violators (DUI, Speeding, etc).  Paying $200 or so to a defense attorney is worth it when he can dismiss your ticket entirely (which may be very possible scenario in your case).  These lawyers know how to play these type of cases, know courts and court proceedings, know judges and prosecutors and their styles.  Good luck.

http://lawyers.findlaw.com/lawyer/firm/Traffic-Violations/Phoenix/Arizona