How do you crack an egg? 
Crack sharply on a hard flat surface, and pull the halves apart on the break.  Use a flat surface so you don't shove shell bits into the albumen. When you pull, don't shove your fingers into the crack for the same reason. Most of the skill is in knowing how hard to hit the egg to get a crack without shattering the shell. Once you get really good, you can do it one-handed: hold egg in palm, smack on surface, and use your thumb and fingers to push it in half. It takes some practice. 