A high keyword difficulty score is a tool’s guess, not a real barrier, so treat it as a useful guide rather than ground truth. Difficulty is a number invented by SEO tools, not a metric Google publishes or uses, and it is mostly built from backlink-based proxies: how many and how strong the links are to the pages currently ranking. That is a reasonable shorthand for competition, but it is an estimate of one factor, and it can be wrong about the query you actually care about. The score is worth glancing at, but the verdict it returns is a prediction to validate, not a wall to accept.
Because the score leans on links, it misses things links do not capture. It can miss intent, where the ranking pages do not really answer what searchers want and a better-matched page can leap past them despite their backlinks. It can miss content gaps, where the existing results are dated, shallow, or incomplete and a stronger page wins on quality. And it can miss weak-but-high-authority competitors, big domains ranking with thin pages on the strength of sitewide authority rather than a genuinely good answer, which the link-based score reads as formidable when they are beatable. A high number can therefore sit on top of a SERP that is softer than it looks.
The error to avoid is treating the difficulty score as fact. Different tools produce different numbers for the same keyword, which alone should tell you it is an estimate, and acting on the number as if it were Google’s own assessment means abandoning winnable queries or chasing unwinnable ones based on a proxy. The score is a starting hypothesis about competition, useful for triage, not a final answer about whether you can rank.
To use it well, take the difficulty score as a first filter and then judge the real SERP yourself. Open the results for the keyword, read whether the ranking pages actually satisfy the intent, and look for gaps, dated content, or off-target results you can beat. Let a high number prompt a closer look rather than a retreat, and let the live SERP, not the tool’s guess, decide whether the keyword is genuinely hard.