WHAT'S YOUR BIGGEST STRUGGLE IN DESIGN?

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I'm thinking about doing a series (of some sort) that addresses your common design challenges so I need your help! Tell me, 
What's your biggest issue in design?
(and no, money can't be an answer 'cause I can't help you with that one!)
Do you have trouble selecting paint? Not sure where to start on an overall plan? Are you someone who starts off with good intentions but ends up all over the place? Having a hard time pinpointing your style because you like a bit of everything? Do you ace your design but fail at styling?
Whatever your challenge, please take a moment to let me know in the comments--your feedback is appreciated as I craft these posts to answer your biggest questions!