A child support modification lawyer will complete and submit a motion with the court that sets forth the rationale for the change, and the actual change that is requested. The necessary paperwork involves submitting a copy of the court order that sets forth the current child support arrangement, supporting affidavits that outline the change in circumstances and a legal brief that details the party’s arguments. The court will evaluate all of the documentation that was submitted and may schedule a hearing where both parties can present their case.