Some divorces are simple, and theoretically a layperson (a non-lawyer) could fill out all the forms him- or herself. Usually a simple divorce is no-fault, with both parties residing in the state, and no child support or custody issues involved.
True, the law of your state probably will not require you to have a lawyer for a divorce. Some people, citing expense, consider going without a lawyer. Other parents believe that a lawyer only serves to escalate the ongoing hostilities that are present in such an emotional decision as a divorce. And some just prefer to handle such personal arrangements as a divorce themselves.
Lawyers, however, do a better job of handling these matters. They are familiar with the law and the rules of procedure. They may “know the judge,” that is, they are familiar with the judge and his rulings and know the best approach. They are also able to shield their client from his or her own anger in the proceedings. It is a rare person who can keep emotion out of an argument as basic as a divorce. Judges will see this anger and resentment, which will do the person representing him or herself no good. In this way, lawyers often serve to prevent the escalation of hostilities.