Start with the problem, not the product you picked

The research usually begins after the real decision has already been made.

Ask someone what they are shopping for and they will name a category. Ask what problem the category solves and there is often a pause. That pause is where the useful work sits. A category is a solution somebody else designed for a general version of your situation, and adopting it early means every later question is narrowed by a choice you never consciously made. You end up comparing options within a set rather than asking whether the set is right. The comparison feels rigorous because it involves numbers and tabs, but rigour applied inside the wrong boundary is just tidy error.

The repair is small. Write the problem as a sentence with no product nouns in it. Not a new set of storage containers, but the leftovers go off before anyone eats them. Not a bigger television, but three people cannot see the screen from the couch. Stated that way, alternatives appear on their own: rearranging something, using what you own differently, borrowing, hiring for the one weekend a year you need it, or fixing the thing that already exists. Some of those cost nothing. If the sentence still points at a purchase after you have listed the alternatives, you now know precisely what the purchase has to do.

That sentence also becomes your test later. When you are deep in a comparison and losing your footing, read it again and ask whether the difference you are agonising over actually touches the problem. Most of the time it does not. It touches a feature you have started caring about because it was easy to compare, which is a different thing entirely. Keeping the problem visible is the cheapest discipline in buying, and it is the one that survives contact with a persuasive page. Keep it written down somewhere you will actually see it, because a sentence that plain is easy to remember and surprisingly easy to abandon halfway through an evening of comparing options.