Cut off the tabs securing the stopper to the bottle. The stopper has plastic tabs around its border that secure it. Take the knife and insert it into each tab, then slice through them. Work your way around the stopper to release all the seals. You can also use scissors to cut the tabs.
Big spoon or little spoon:Put your hand around the neck of the bottle.Secure the small tip of the spoon under the edge of the cap. The bottom of the spoon bowl should be slightly resting on your other hand.Like the lighter method above, use a lever action to bring the back of the spoon down and pop open the bottle.