Oddly Wired
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competence

You overestimate your ability on tasks you find difficult.

The hard-easy effect describes the tendency to overestimate one's own performance on hard tasks and underestimate it on easy ones.

When a task is difficult, individuals fail to account for how likely they are to miss critical information. Conversely, when a task is easy, people assume they are 'above average' and underestimate the likelihood that others will perform equally well.

Confidence is a poor predictor of difficulty.

Where this comes from

Study
Lichtenstein and Fischhoff, 1977
What the check found
The definition of the hard-easy effect is accurate, and Lichtenstein and Fischhoff (1977) are the correct authors for this foundational research in calibration of probability judgments.
Confidence
Solid, with limits
competenceperformanceoverconfidence

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.