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

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 (you may ask questions)

Ion know the answer so i just type more than 20 letter so i can get points to ask questions to write down on my homework

Ibelieve the rising demand for workers on the huge plantations