I'll give this a go as it took me far too long to work this out - and some might disagree with me.

Taking every single ounce of advice people give to you.

I've found that everyone has a pathway in life, a way they are able to unlock and achieve their full potential. I found that what works for one person, may not always work for another. When I was starting out I would listen without question to anyones advice, peers, managers, business owners and attempt to shape myself to accommodate that advice & guidance - to only find that it would stifle me. Everyone has an opinion on how to do things best, but sometimes you just need to believe in yourself and your own capabilities.

Now I'm not saying don't ever listen to anyone, just be selective on who you listen to.