You don't need a lawyer if you can do it yourself, but you obviously are clueless, as are the other answerers here. If there is a court order that he pay you a specific amount of money, you can apply for contempt, which is usually much more effective at getting someone to pay. If the divorce judgment or agreement for judgment does not have a sum certain, you will have to ask the court to issue a specific order for a specific amount. Then if the ex does not pay, you can apply for contempt.