People can successfully carry out tasks without work documented instructions and have done so for centuries & millenia......... How many documented instructions were there for the Bushmen of the Kalahari to find water? How about documented instructions for the success of armor makers in the Middle Ages? How about documented instructions for the Vikings to make it across the Atlantic? What about documented instructions for the Babylonia to make mud bricks for their cities?
Don't get all wrapped around the axel.
"I personally think" ....and that's where the problems start, the auditor "thinks" but doesn't really "know".