A tournament is not the time or place to try out that new move you learned last week, or to futz around with your fanciest. DO WHAT WORKS BEST for you. Only your best sweeps, subs, and escapes. Don't panic if you get taken down right away. A lot of guys who do BJJ tournaments as white belts are also well-versed in Judo. Play your game....be aggressive...and don't eat too heavy a breakfast. Bring Gatorades and bananas/apples for in between matches. Good luck!