By first taking assessment of your areas of clarity and unclarity you can take the lay of your own land.
By taking the lay of your own land you can fearlessly assess strength and weakness.
When you know where you are strong and where you are weak, you can formulate a strategy for coming in and going over.
With a strategy of coming in and going over (advance and retreat) in hand you devise a plan of communication.
When the part of you that is clear communicates with the part of you that is unclear, can either remain unchanged?
That is how to write a persuasive essay.