Has anyone here used an authorized representatives when submitting the request for citizenship documentation? Do you think it is worth the cost?

Thank you.

It is not a rocket science ... and you can do it
But you can always use a service if you prefer a professional doing the job and you like to spend some money for that. Mainly it is personal preferance. Your life will be easier if the professional is good .... if not ... you will regret for entire life for using a rep.

Collection of all documents is most taxing task in application filing process which still will be your responsibility. A Professional will have 2 roles - 1. Proof reading 2. being your personal Post office.

But knowing from other post by you , seems like you need an immigration lawyer to wrinkle out certain unknowns.