You can wait to substitute out your present attorney until you decide to hire someone else, and the new attorney will fill out the form for you and file it. The form for filing the motion is the mandatory OSC and Application for Order and Supporting Declaration forms (FL-300, FL-310).
I think you mentioned once being in Fresno County. You might want to take a look carefully at their local rules on mediation and child custody hearings. This is one of those matters that vary considerably from county-to-county. Fresno does things VERY differently compared to other counties.
http://www.fresnosuperiorcourt.org/_...20(1-1-08).pdf