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with unmanaged, not the first to make this mistake I assure you.
Best bet and you'll probably end up with much better documentation, would be to get a selection of your users, and have them make a start on it. That's what you should have had in place from day one near enough. Seeing as the training docs are as much of a moving piece as the system, got to be done in tandem. It would have given you a better handle on where your priorities should have been during the project as well.