Yes, but not recommended. DUI / OVI law is overwhelming, technical, and convoluted. Each individual courtroom, judge, and prosecutor also impose their own obstacles and procedures. Not knowing the law will not afford you any leniency either (in fact, it usually works the other way around). An experienced DUI lawyer has the knowledge and experience to manage the very specific issues that might come up in your case, the law that applies to those issues, and how your court / prosecutor / judge might respond to the arguments that can be raised.