Step 4: Pin Hair Up
Form your hair into a bun. I found it easiest to twist my hair, then loop it around to create an oblong bun (instead of the standard round one) to best accommodate this bun slide.
Use one hand to hold the bun in place, then slip the card around it. Shove the pen (or pencil, or chopstick) through both holes, threading it underneath most of the bun as it passes under the card. This will bow the card, and pin the hair in your bun against it.
Nice work - you've done it! This clip should be more than enough to hold your hair in place all day.