How to retain a discovery while acting as your own Attorney? In the first stages of my girlfriends D.U.I arres?

Since you do not trust lawyers the best solution would be for you to file a motion for discovery and they have to turn everything they have over in a timely fashion, if they do not then file a motion to compel discovery and the court will review your documents to prove that they have not submitted everything and anything they do not provide to you will not be admissible unless it is discovered later.}{