Final answer:
A sales representative can show a customer how to use or assemble a product without reading the instructions if they are well-trained and know the product well.
Step-by-step explanation:
A sales representative can indeed show a customer how to assemble or use a product without reading the instructions if they have been adequately trained and are familiar with the product. Especially in scenarios where a product is new or complex, having a knowledgeable sales rep demonstrate its use can greatly enhance customer satisfaction and reduce frustration. This hands-on approach can be a part of the sales strategy and customer service to ensure the client understands the product's value and functionality, even if this means the sales rep has to explain without relying on the written instructions.