That's basically how the whole industry works, where I spent the last ten years of my corporate career. There are mountains of procedure and policy manuals, which you may see once or never at all. You do your job the best way you can figure out. Then, years later, there is an audit and you get called out on the carpet to explain why you weren't following the rules laid out in some obscure document that you may or may not have read once but certainly can't remember, and which anyway is far from clear.