Couldn't Not Start

So, I've already started National Novel Writing Month. I just couldn't not start. Monday, on a flight, all that time to write, I had to get started. Now, sitting in the airport, waiting for the next flight, this one home, I am writing again.

Is it wrong to start early. Emphatically no. There's no prize. There's no real rules. They're more like guidelines. Besides, like I said, who could pass up the chance to write for three hours on the way to Minnesota and on the way back to Texas. That's some prime writing time.

The worst part is, I am having so many second thoughts and I'm only a few thousand words in. I'm second guessing the tense, the plot, the characterization. I remember these doubts and second thoughts from all the previous Novembers. This time I'm determined to press on despite those nagging doubts and thoughts.

I know some of my followers are National Novel Writers, how are you guys prepping? Anyone else cheated?