Crab legs are really one of the easiest things to make at home. Generally speaking, the crab legs you buy will be pre-cooked and frozen at sea to help ensure maximum quality, which means all you really have to do is thaw, reheat, and serve. This same technqiue will work with any style of crab as well, so long as it's pre-cooked and frozen. If by the off chance you get some nice fresh crab, you may need to cook it a bit longer to hit the 145 degree minimum tempurature.
If you're curious as to how to clean crab, we have a video tutorial we've included below to take you through the process step-by-step.