50/50 custody schedule adjustment

Ex and I are trying to switch from the traditional every other week thing to a 5/2/5/2 rotation because the kids kept complaining about having to pack and switch. Lawyer said we need to file an agreed modification. Anyone done this? It's weird because me and the ex are actually getting along better since we split and can actually agree on stuff like this. Just want to make sure I'm not missing something obvious before we go through the formal process.