Once you get the cloves apart, you'll have to peel the garlic. While the cloves are sticky and the skin can be tough to crack and peel, Pépin has a simple method.
Cut the stems off the cloves and place one on your cutting board. Lay your knife flat atop the clove and tap it with a heavy knife, or slam your palm on the top side of the blade.
This motion cracks the skin and loosens the clove so it easily slips out the bottom of its casing when you pick it up by the pointy end (opposite where the stem was).