It's never a good idea trying to explain to a customer, how to do something. You can be held liable and loose everything.
You are a professional. It took many years to get where you are and learn what you have learned. That knowledge and experience can not be taught in a 10 minute conversation with a home owner.
You are not going to someones house to give them an education on how to do something. Your there to provide service, not DIY!
