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The guides hold the method, the failure modes and the control discipline. These are the questions around them — what kind of document you are actually writing, how to get it out of the person who knows, and what is worth doing at all when the company is five people.
Stop trying to document the process. Document one task, during the work, this week.
Free to make, expensive to keep. Use one only where words genuinely fail.
Not a documentation project. Start with one page listing what exists and who owns it now.
Give it your capture, ask for structure, never for content. Then test it as you always would.
Most documentation advice assumes a compliance function. At five people, most of it is waste.
They are not grading your prose. Three other things decide the finding.
The expert has stopped noticing half of what they do. How to get it back out.
Four words, four different documents. Mixing them is why the result is unusable.