The mistake that sinks you usually sits in the one spot you were too confident to double-check.

Errors do not hide in the hard parts, because the hard parts get attention. They collect where you were certain, since certainty is the thing that stops you looking. The gap is rarely a lack of skill. It is the small, reasonable decision that one section did not need checking.

Before you send or finish anything that matters this week, find the part you feel most sure about and check that one first. It will feel like a waste of two minutes, and most times it will be. The times it is not are exactly the ones that would have cost you.