You should contact the diverson program at the County Attorney's Office and see if they will still alllow you to enroll. You may have to pay the court fees for filing, but they may allow you to enroll. You may even want to ask them about entering diversion at the arraignment.
You would likely need to hire a lawyer. We generally try to avoid the court by seeking diversion prior to the court date. I would suggest you hire an attorney to appear with you. Happy to offer a free consultation, but I'm in Omaha. You can call 402-455-1711 to see if we can set a time to talk.
You can ask the County Attorney for diversion. Generally it helps if you have an attorney, but if you cannot hire one right now go in and ask for the diversion. If the county attorney says no then I would recommend at least having an initial appointment with an attorney to see what your other options are.
I am a licensed attorney in the state of Nebraska. However, the advice I give here is not to be taken as legal advice. It is merely my opinion based on the limited information given. In order to assure that your legal rights are being properly represented I would always recommend going in for a consultation with an attorney to explain your case in detail and answer any questions the attorney might have.