Take your chopstick and measure 6" starting at the tiny tip and mark a line. Then, cut using a hobby knife or saw.
Sand the raw edge of the cut until smooth, and also sand the tip of the chopstick so it is a nice point. Now, give the entire chopstick a light sanding, as this will make the stick slide through the hair easier and also produce a better paint job.
Apply three coats of acrylic paint to the entire chopstick, allowing correct drying time between coats. It's helpful to clamp a clothespin on the thicker end and stand the pin up so the chopstick is positioned at the top, with its point on the table.