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Get one.
Until then, most important thing forgotten by rookies is beating the signals.
When you walk out with the bar (yes, I know, monolift, but remember, I started long before all this high-falutin' mechanical stuff), before you descend, make eye contact with the head ref, who should be right in front of you. Give some sort of nod to indicate that you are ready, and you will be given both an audible signals (SQUAT!) along with a downward motion of the arm. After you come up succesfully. You must wait for the rack signal. Then take a step forward. At this point, then spotters will help you back into the rack.
In some federations, the lifter does not have to move forward before the spotters take the bar, but it is best to train for the most difficult conditions, that way it is easier on meet day.
In the bench, after getting a hand off, you must demonstrate control before lowering the weight. This means just hold it locked out for a second, then lower the weight. You will be given an audible (PRESS!) command, at which point you ram the bar to full extension, evenly. Do not lock out one side before the other, as uneven extension will get you turned down. Also, keep the head, feet, and hips flat at all times. In some feds, the head can be up during the decent, and you can raise onto your toes, but once again train in the most strict manner possible.
The deadlift has only one command (DOWN!) followed by a gesture with the arm. You must pull it evenly without resting the bar on the thighs or rebending the knees.