With the possible exception of folks who are meticulous record-keepers, gathering the necessary evidence to support your Net Worth document can be a nightmare. All I can advise here is "keep at it," since the problem won't get solved by itself. It's easy to procrastinate, but it's unlikely that you'll be able to proceed meaningfully until the financial information is deemed complete, accurate, and acceptable by "the other side."
The discovery process can involve several related legal instruments, such as Interrogatories (written questions requiring written responses from the other side to clarify one or more areas of concern) and Examinations Before Trial, also known as Depositions (the same idea, but done verbally under oath, with a court reporter taking notes).
And here's where the trust and goodwill you've been building during your separation -- by treating your ex with courtesy, scrupulous honesty, and kindness -- starts to pay off. In our case, my ex-wife recognized that the delays and expense in obtaining some of the documentation simply wasn't worth the couple of hundred bucks she might have gained in the ultimate property division. She knows -- because I demonstrated it to her over and over again -- that I have no desire to cheat her or our children out of anything. This allowed us to reach a fair settlement without my spending another $1,500 and several months trying to gather more documentation. We agreed that the dollars are far better spent on our children than on appraiser and bank fees.