Ask the customer about what project they are working on and get a feel for their experience. Solve the customer's problem. If they are inexperienced, walk them through the process step-by-step. Be sure to confirm that they have all the tools and safety gear they need. If they're experienced, don't waste their time. Get them the item they need and out the door. Most people fall somewhere in between. Tailor your service to their needs and knowledge.