When working with wood, you'll often need to use a power drill for pre-drilling. It's important to pre-drill to prevent your wood from splitting. It also provides a strait path for the screw to follow during assembly. Choose your drill bit based on the diameter of the screw. You'll find that every power drill has a forward and reverse function. To attach the drill bit, run the drill in reverse, opening the "chuck." To secure the drill bit, hold it in place while running the drill in the forward setting. after pre-drilling, use the same technique to secure a screw bit!