If you have an unpleasant job to do, go at it wholeheartedly, get it over and done with, then it won't hang around to bother you any more.
Translates as
If you have a jar of Nutella, go at it wholeheartedly, eat it with a spoon straight from the jar, then it won't hang around to bother you any more.
AIBU?
What other rules of life can be translated into Nutella Theory?