Question

What is done to prevent a plan from becoming confusing because of too much detail

Answer 1

When providing instructions or rule to follow, it is important to make them as clear as possible. Simple commands follow by an example (when possible) are basic steps to deliver a precise massage. 
Another thing is to bare in mind who is receiving the instruction. The receptor should be apt to the plan knowing vocabulary, structures, etc. 
Last but not least, check if the receptor understood the plan, double check if you think it is necessary