As with any tool, the answer is “it depends.” The Keysearch target difficulty score is more reliable than most but in the end it’s just a “guess”. Sometimes you can aim above the score and rank easily, other times not so much. Use it as a guide and consider taking the “Cooking With Keywords” course from Aleka Shunk that covers the tool and a repeatable process with Keysearch that is very effective for most bloggers.