Although one might temper one's judgement by reading "Unskilled and Unaware of It: How Difficulties in Recognizing One's Own Incompetence Lead to Inflated Self-Assessments" by Justin Kruger and David Dunning of Cornell University"
http://www.apa.org/journals/features/psp7761121.pdf
Non-pdf URLs at:
http://www.google.com/search?hl=en&q=Unskilled+and+Unawa...
Should the article apply, one may be doomed!-)