Question regarding pleadings or motions for attorney clients

For those of you who draft pleadings or motions for your clients, I'm curious about the process for that. Obviously, the attorney will need to supply you with relevant information regarding parties, cause number, court, etc, but how is the actual content of the pleading drafted?

Does the attorney supply you with the language and you draft the document and cite check and Sheppardize it, etc? Or do you draft from scratch?

I have a huge forms library, but am concerned about providing a quality product in light of the fact each case will have very discrete factual and legal circumstances, etc., of which only the attorney would be aware of (at first).