Even the best thought out plans go wrong. It happens. People get hurt, things are damaged and it's something we need to accept. Sometimes all we can do is try our best with the best intentions. If it didn't go as planned, that doesn't mean give up because you don't think can do better to fix something, it means learn from what went wrong.
Courage is not about having the strength to go on. Its about going on when you don't have the strength.
And I believe you know you can.