There is similar stuff to what you described in the next few hundred designs that will be uploaded. I think those 40 fields should be segmented and grouped based on relevance. It is quite scary as a user to be bombarded with so many inputs at once. The task of filling them all out gives them anxiety. Try to auto-fill whatever you have access to, try to segment as much as possible, and if you have the possibility break it down to smaller steps. If you can, show them progress and encourage them along the way. I hope that helps!