Yeah, the problem is, no matter how good you are at doing something, there is somebody somewhere who is just as good or maybe better at the same thing, and he or she likes it. That person will kick your ass if you follow Scott Adams's advice.
If you want an average successful life, it doesn’t take much planning. Just stay out of trouble, go to school, and apply for jobs you might like. But if you want something extraordinary, you have two paths:
(Advice that he apparently learned from an anonymous lending officer at a bank that isn't around anymore: http://en.wikipedia.org/wiki/Crocker_National_Bank)