There are plenty of challenges we have as artrepreneurs, but two common ones that exist around our ideas are 1) We have a great idea that no one understands and we're afraid everyone is right.  2) We have a great idea that everyone thinks is a good idea and then when we pursue it, we realize it's not right for us.  There's probably 100 more ways that list could be expanded, but the point is, sometimes yesterday's great idea is tomorrow's regret and that's okay.  The important thing to know is why it's no longer a good idea.  Are you running away from your idea or do you see the long-term vision doesn't look so appealing?