This sometimes humorous article by Justin Kruger and David Dunning describes a series of four experiments that “that incompetent individuals have more difficulty recognizing their true level of ability than do more competent individuals and that a lack of metacognitive skills may underlie this deficiency.” It also includes a nice review of the literature and several examples to support their study.
Unskilled and Unaware of It: How Difficulties in Recognizing One’s Own Incompetence Lead to Inflated Self-Assessments, Journal of Personality and Social Psychology 1999, Vol. 77, No. 6. 121-1134