You might not have time to practice as much as a professional but you can have their set up in a matter of minutes, concentrate on keeping your upper body balanced on top of your lower body with your arms centered and not ahead of the ball
Maintain a constant posture throughout the entire swing so that your body does not move towards the ball during the swing and cause the heel of the club to make contact with the ball
Rotate your body as you swing and knock an area of sand out of the bunker