Stepping outside your area of expertise is as dangerous as stepping off a cliff.
The metaphor is from Dr. Thomas Sowell
Dangerous cliffs
johnbartels.com
This and That
Stepping outside your area of expertise is as dangerous as stepping off a cliff.
The metaphor is from Dr. Thomas Sowell
johnbartels.com 
True, but sometimes you have no choice.
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True. Thanks for the comment. I wish more readers would comment.
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