Before taking on an issue at work that's bugging you, such as constant tardiness for a meeting, make sure you have the authority and reputation to back your effort, says Dorie Clark, author of "Reinventing You: Define Your Brand, Imagine Your Future." "Go to some trusted colleagues and bounce it off of them," Clark says. "If they think it will be a Herculean task, then you might want to reconsider."

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