You can always represent yourself, but the age-old adage of “he who represents himself has a fool for a lawyer” comes to mind.  DUI laws are complicated, the rules of evidence are complicated, criminal procedure is complicated, etc.  That being said, not all lawyers specialize in DUIs so research carefully before you commit to an attorney.  An estate attorney may be as helpful in your criminal proceeding as a pediatrician would be for brain surgery.  A qualified attorney can review your case for defects and present arguments in your defense.