I can never decide how many garlic cloves to use because they are all such different sizes. If a recipe calls for two cloves of garlic, but my garlic is huge, should I still use two cloves?
Here's a handy guideline for you: two cloves of garlic, when chopped or minced, should equal 1 teaspoon.
See my previous posts on using a garlic press and bottled garlic. While I believe that nothing beats fresh, when the garlic is a seasoning and not a major source of the flavor of the dish, the bottled makes a decent short-cut.