Roasting a whole fish is actually more simple than you think. Start with a good fish. Go to the market, and look for one that is firm, but not slimy. Get a fish with the scales already removed. Give it a smell - if you catch a scent of the ocean, the fish is good. If it smells like ammonia, the fish has gone bad. And don't be shy about getting a pre-gutted fish - it makes everything faster and easier. Once you've cooked the fish, you'll know it's done by inserting a knife near the head next to the spine. If the meat pulls away easily, it's done. Cut off the fins, then run your knife along the spine and the meat should pull away. Flip the fish over and repeat. Once you can see all the bones, grab the end closest to the tail and gently pull upward - the skeleton will come right out. Next, fold the fish back together so it's whole again, plate and serve.