How to write product instructions people actually follow.

A printed manual asks a customer to translate paragraphs into actions. A guided tutorial does the translating for them. The difference is not design polish, it is sequence: one decision per screen, in the order the person meets it in real life.

Start from the moment of confusion, not the feature list.

Write down the exact question a customer asks out loud when they are stuck: "Which cable goes where?", "How do I turn the heat on?", "Where is the filter?" Each of those questions becomes one card. If a card answers two questions, split it.

One action per step.

• Lead with the verb — "Slide the tray out" beats "The tray can be slid out for cleaning."
• Show the thing — A photo of the actual part removes every naming argument.
• Name the success state — Tell people what they should see or hear when the step worked.
• Move edge cases behind a tap — Keep the happy path short; put troubleshooting in a detail sheet.

Write for a phone held in one hand.

Your reader is standing up, possibly holding a part, often in bad light. Short lines, large type and one image per step are not stylistic choices — they are what makes the instruction usable at arm's length.

Test with someone who has never seen the product.

Hand them the tutorial and stay quiet. Every place they hesitate is a missing card, a vague verb, or a photo taken from the wrong angle. Fix those three things and completion rates move more than any redesign will.