How to use a waiter's friend, in three simple steps:
1. With the corkscrew's blade, cut the foil under the second lip of the bottle (to prevent foil from falling in).
2. Center the point of the screw on the cork, and turn firmly to anchor the worm (the spiral).
3. Turn the screw gently and firmly without pressing down, until the worm is halfway down the cork. Place the lever on the lip of the bottle, and pull up until half the cork is exposed. Turn screw again, until the worm is through the cork, and then pull until the cork is free.