Here are the steps to follow to cut and pit an avocado: Cut into the avocado all the way around using a sharp knife. You'll hit the large seed (or pit) in the center, so don't expect to be able to cut all the way through the fruit. Once you've cut around it, twist both sides, and pull the halves apart. Take the knife and whack the seed; pull to remove the seed, which will be stuck on the knife blade. Using a spoon, gently scoop the flesh of the avocado from the shell.
Try this Kitchen Shortcut with Gazpacho with Avocado and Cumin Chips.