Chief, that looks like a Dungeness, no? If so, clean out everything that isn't edible (in other words, anything that isn't soft and white or white-red combo, in the case of the claws and legs). There is enough meat in one legal size Dungeness to make a meal for at least one person. Just break the body in half, rinse out each side, and leave the halves to drain meat side down on towels or paper towels. If you want them to stay cold, let them drain onto towels in the fridge.
Then when the water has drained off (takes just a 10-15 minutes, provided you didn't get crazy and submerge it or blast it--doesn't take much water pressure to clean it out), you can start breaking the legs and claws off. Set those aside.
Now pick the meat out of the body. The chambers are thin enough that you should be able to gently break them all and pick the meat out. As for the legs, some folks crush them, using a mallet or tenderizer. I find it's much easier to simply snap the legs and claws with my fingers, and use one of the pointed ends of a leg to help scoop out the leg and claw meat.
Enjoy with some melted butter that has a bit of crushed garlic, serve with french bread. Have a cold beer or three with them, too.
Dungeness crab...one of the best natural foods on the planet, and very simple to clean and eat. Glad I live in a place where they grow wild.