...or how to use a waiter's corkscrew... use the knife on the opener to cut thru the foil/plastic that covers the neck of the bottle. Make the cut at about ¼” down from the top edge of the bottle (or wherever the first ridge is). Hold blade in right hand (parallel with the ground) to bottle neck while twisting the bottle counter-clockwise with the left hand. After a full turn, remove the end of the foil.
Close the knife blade and pull the corkscrew out so it’s perpendicular to the handle and the lever fully (see drawing) extended.
Hold bottle in left hand. With right hand, center the tip of the corkscrew on top of the cork… insert corkscrew while turning clockwise until it is fully inserted into the cork.
Push the end of the handle down to 45º and fold the lever down and lock onto the top ridge of the bottle neck.
Now pull the corkscrew up slowly and evenly and twist slightly as the cork is about to exit.