If the defendant's plea was not knowing and voluntary due to impairment, then it may be possible to set it aside. You should be aware that answering the questions in the plea transcript falsely could subject the defendant to additional charges.
If you did not complete the treatment in a timely manner, then you will need to have a new assessment and start the treatment over. You will not be eligible for a license until you have completed everything and the 508 form is sent to DMV from the assessing agency. Any limited privilege you have had expires one year from the date of your conviction. It CANNOT be extended while you complete the classes, so you are not eligible to drive after it expires.
One attorney can handle such a case, but it needs to be an experienced attorney. You will never get an attorney to take a case like that pro bono for the reason you stated. It will be too time consuming and would result in the lawyer going broke. Talk to the court appointed attorney and make sure they are up to the task. Courts usually will not add additional attorneys on the case unless it is a capital murder case.
In North Carolina, DWI is a misdemeanor. It will always show up on your record if you are convicted. It can be used to enhance the punishment for you if you get another one. All employers are different as to how they look at a conviction for DWI.
It is allowed, but it is always at the discretion of a judge. An experienced traffic lawyer can look at your record and properly advise you as to the best course of action for you. A PJC may not be best.