Don't sweat it. With more experience, it will sort itself out. Just getting to know some of the folks your regularly compete with is huge. Once you're comfortable in the environment, you relax and don't do nearly as many dumb things. Doesn't take long either.

The only 'rule' you should stick to (other than the official rules) is to get your rest. Get off your feet whenever you can and don't play drunk or hungover (trust me on that last part d. You'll always play better when you're not fatigued.