When your leg starts shaking from buck fever and your at draw for 20 minutes cause you saw the deer working its way in and your breathing like a linebacker after a 100 yard run.......
Just relax and remember how you held the bow and released on the range. My opinion is that at first, people are so worked up they grip the bow tight and jerk their shots (uhh...sound like I had this experience, huh!!!

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My advice is simply this....relax, aim true and think about taking a good shot versus a marginal one. You'll do fine.
Welcome and good luck to you!!!!!!!!!!!!!!!!!!!!!!!!!