Those clamps are one time use. You WILL break it removing it, but replacements are cheap.
Have you ever changed your spark plugs before? When you remove the plastic cover you will see the coil packs. Their should be two bolts holding the coil packs in. I believe its a 10mm nut. Their are two ground straps, one at each end. On the coil you will see a silver retaining clip. Using a flathead screwdriver gentley pry up on the metal clip. Pull it up and then pull off the connector on the back of the coil pack. The coil pack then can be pulled up and you have access to your plugs. You need to remove them to pull the valve cover.