Know the terms of the plea bargain before the Donald hearing.
When there is an offer on the table (plea bargain), the Judge will often conduct a Donald hearing. In this hearing, the judge informs the defendant of the terms of the offer. The exact sentence he or she will get (or the sentence range), and also outlines the risks of not accepting the offer, including the minimum and maximum sentence he or she would receive if the deal is rejected and he or she is ultimately found guilty.
In Arizona criminal cases, including DUI cases, a person accused has the right to know what kind of plea bargain is on the table (if any). They have the right to make an informed choice of whether to accept the agreement, or reject it and proceed to litigation or trial.
If you decide to reject the offer, you will not be able to complain that you didn't know about the offer later. You are in charge of going to trial. You shouldn't feel forced.
The reality is that many criminal defendants in Arizona that reject a plea bargain and then lose at trial end up getting a greater penalty than the terms of the plea agreement called for. A Donald hearing is a way of protecting the court.