Learn How to Handle a Pair of Pliers
Remember, the quicker you get a fish back into its habitat, the less physiological stress it experiences. You've got to work fast, which means having a sure hand with a pair of pliers. Keep the fish in the water and use the pliers to grasp the hook and twist your wrist, so that you simultaneously unhook and release the fish. Try to touch the fish as little as possible, to avoid damaging the protective mucus coating on its skin. That slimy stuff helps protect a fish from disease. If it's necessary for you to handle the fish, make sure your hands are wet.