[sdh]

"There are forces outside your control"

This one is huge. You have to persevere and not let things get to you. At a micro level this will cause all sorts of unexpected and frustrating challenges for your new venture and you'll just have to roll with the punches. If you're the typical OCD entrepreneur, you'll have to be extra careful to avoid digging too deeply and for too long into why one of these happened.

I'd say this is one of the primary causes of entrepreneur insanity.

You got scored on. Forget it and get ready for the next challenge.