Excellent point. There are plenty of ways to acquire the expertise you don't have (get a partner, hire someone, use an intern, etc.) to grow your business.
It's important to identify assumptions that limit your options or stop you cold. Thinking you can't do something is limiting; thinking "HOW can I solve this particular problem?" gets your mind to shift gears and instead generate solutions.
BTW, I love that Yoda quote--very apt.
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