How do i file motion to modify child support on my own w/o ...

To do this without an attorney, you would need to go where your child custody hearing is taking place. Go to the Law Library, if not you can always go online and get it through the court's website Self-Help/Self-Service link and ...
Lawyer DUI Phoenix - http://lawyerduiphoenix.com/lawyerduiphoenix/

Source: Google Alerts - Child Custody