You probably can get the case continued on your own once or twice without needing any special training or any special relationship with the Prosecutor's Office. You probably can get the registration and insurance violations dismissed if you show that the car has been sold and especially if you show that you own some other vehicle that is properly registered and inspected.
This may take two to four trips to Raleigh to accomplish, however. And you will not know which prosecutors to ask nor the best way to approach them. If a lawyer represents you, you will almost certainly not have to make the drive from Guilford County at all. I would recommend considering hiring a lawyer. By the time you pay for gas, you are not likely to save very much and a lawyer will afford you the piece of mind of knowing that the case is being handled properly.