When it comes to a DWI, saving money any way you can is going to be very important. The only way you are going to save money is by getting yourself a great DWI lawyer. Handling a DWI by yourself is not recommended at all, because you do not know the law well enough to represent yourself.
That is entirely up to the lawyer on how he or she conducts business. Some lawyers will work with you, and some won't. You should be very upfront with your potential lawyer on your finances, so no one is misled about anything. You would not want to give your potential lawyer a bad taste in their mouth about what is really going on.
That is great news for you and especially for your case. You will feel much better knowing that you have gotten a lawyer that can get the job handled. Your best bet is to sit back, and get ready for your court date. You lawyer will advise you on everything, all the way down to how to dress yourself for that day.
Good luck in court.