I am naturally optimistic, which is a great thing for my attitude and my ability to work with people, but once it caused me to overlook a possibility for a problem with my project that turned into an actual problem. I learned from that that I can be optimistic, but I should always have a contingency plan in place. And I do. And actually, it allows me even more peace of mind because I know that I’ve always got a Plan B, just in case.