I design boardgames and it's easy to write a lot of rules. It's more difficult to write concise rules. Most of my time is spent editing rules to their absolute minimum.
"I have made this letter longer than usual, only because I have not had time to make it shorter." - Blaise Pascal
Reminds me of how I document procedures. I spend a significant amount of time thinking about how to write things so that I provide enough information for a Jr to understand each step (and hopefully learn something) without over explaining. Organization is also important.
I ctr-F'd to search for this quote and am happy to see it mentioned.
Brevity is an art, and it is hard.