What does it mean to put it all down in black & white? It means there are no questions or gray areas.
You refer to the handbook when:
*you don't know how to do something
*you want to learn something new
*your coworker is on vacation & your boss is asking you to fill in
*you want to train your coworker as a backup
We could go on & on. Document the process & you won't be sorry.