You're right, if you take it down to the meta level (here's how you turn the faucet) it can get a bit silly.
Still, I don't think there's anything wrong with walking them through the job once you've completed it and demonstrating everything. You don't have to say "here's how you turn on the faucet" but you can certainly demonstrate it under cover of showing them what you did.
My guess is that if you give your customers a bit of time to ask any questions they might have, you'll discover who is potentially going to have problems. A quick walk through should be enough time for them to ask questions if they have them.
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