Many say consistency is the key to being a good racer, but consistency means nothing if your technique is wrong to begin with. Fortunately, technique is something that can be learned, so if you get out on the autocross course and run the slowest time, do not give up. Instead, learn from your mistakes and alter your driving style.
Being smooth at the controls is the key to running fast. In order to be smooth, you must have the correct seating position, foot position, steering wheel grip, and a good mental map of the line you are planning on running through the cones. Each of these items must be understood and perfected before you will be able to run fast consistent lap times. Fortunately, seating and foot positioning will be the same on all autocross courses, so once you have perfected those, all you will need to worry about is running the correct line.