do (oneself) a favor

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do (oneself) a favor

To do something that helps or betters oneself. Do yourself a favor and go to college—now that I'm older, I regret not having that experience. Because I knew that I had to get up at 4 AM today, I did myself a favor and went to bed early last night.
See also: favor
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

do someone a favor

 and do someone a good turn
to perform a helpful service to someone. Would you please do me a favor and take this letter to the post office? My neighbor did me a good turn by lending me his car.
See also: favor
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.