If I plead not guilty, can I fight the ticket on my own, without an attorney?

Yes. However, you will be required to take time off from work/school or your other activities to appear in court, possibly on more than one occasion. Even if you have a lot of free time and you are interested in representing yourself, there are many fine points of law and legal procedure with which you are probably unaware. Not knowing any one of these points can make the difference between having your ticket dismissed and being found guilty and getting points. It’s been said that “he who represents himself has a fool for a client”. So call the traffic ticket team before you go to court.