Every single person who gets that first offense DUI (what state, by the way?) is where you are pretty much. Worried and scared and trying to pre plan how this will go to give themselves reassurance, try to predict exactly what is going to happen. This can be a headache for busy attorneys. You'll find they don't care to talk to you a lot when it's not necessary, do not provide a lot of hand patting and reassuring.
IMHO, the best thing you can do for yourself right now is get into the court mandated assessment and evaluation. And if it even in some tiny way indicates you might have a bit of a drinking problem (even if you don't think you do) I'd get myself into some sort of outpatient rehab program before the court date. Because they have seen thousands of these situations, and the more you can look like this might accidentally have been a one off, and that you have immediately accepted that it happened and done everything in your power to make sure it is not going to happen again, the better for you.