To pursue a modification, you must file a formal petition with the court that initially oversaw your divorce. Either party may file to modify the Arizona divorce decree provisions for child support, child custody, parenting time, and alimony.Want to know how to file for divorce in Arizona without a lawyer? This eleven-step guide has everything you need to get it done in Arizona. Some courts offer special programs, such as counseling, or require additional steps, such as mediation . ANSWER: You are not required to hire an attorney, and will need to represent yourself if you choose not to hire one. Complete the petition for modification and file it with the court, along with the filing fee. Your ex-spouse needs to be served. Deferral Applications are available at no charge from the Law Library. If the parties do not agree that a modification is necessary, one party can petition the court for a modification with the assistance of an attorney.