This one is simple.  If you or your copywriters have to write instructions for any part of your website, you need to rethink the process you are using that requires the instructions.

Processes, such as buying an item or filling out an information form must be simple and intuitive.

Your visitors and possible customers do not want to take the time to read your instructions, they will use that time to find another website that is simpler to use and reward them with a sale.

You are left with your instructions.