Creatives do your own marketing?

Marketing advice is everywhere these days.
But everyone in business has a lightbulb moment - a favorite piece of advice that gets your wheels turning in a new direction.
The best piece of marketing advice I got was to stop doing my own marketing.
Us creatives think if we're visual we are certainly going to do work as good as any designer.
I was trying to make a great logo, print my own business cards, make flyers and more.
They weren't terrible, but they also weren't "professional" looking.
Oh yeah, I did my own web design too.
But now, I let the experts make me look good.
My stuff may or may not be your cup o'tea, but it shows I am investing in my own company.

What is the best marketing advice you ever got?