Have your mandatory alcohol and drug evaluation completed prior to going to trial.
The first reason for this suggestion is if you do have an alcohol or drug problem, the sooner you face the problem, the sooner you are on the road to beating the problem.
Second, even if you do not have a drug or alcohol problem, the sooner you seek a private, independent assessment, the more likely this prompt action will impress your trial judge, in the event of a conviction or if your DUI-DWI attorney can arrange a favorable negotiated plea in your case.
Furthermore, the results of you actions may also be used by your attorney in his or her discussions with the prosecutor.
If this evaluation shows you have no drug or alcohol problems, this might give some credence to yet another reason why the charges against you might be lessened.