Hi, use the product and always have it were it can be seen. Unless it is a personnel item. You must first believe in the item you are trying to sell. Take care!
Convincing the customer is not important thing. The most important thing is the quality of the product and the service you giving is matching with the customer needs. If your product is good and have attractive price than the customer is already convinced you just need to know which customer is looking for the type of product you selling.
Stand behind your product truthfully and honestly