This is so easy its hardly even a recipe.. but its tasty and we like it.
The real work is getting the meat out, buy some cracker tools.

Bag of Frozen Crab Legs
Lemons (one per person)
Butter for dipping (a few table spoons per person)
Other stuff to dip them in

Cook the Crab
Fill a large pot with enough water to cover your crab legs.
Add a teaspoon of salt.
Boil water.
Add crab legs.
Cook until pink.. +/- 10 minutes.

While the Crab is Cooking
Melt butter in a microwave save bowls.
We like to have one for each person.
Squeeze one big lemon into a bowl for each person
Make sure you have plenty of napkins handy.