Take off the factory black sticker that is on that area. Use a heat gun, or hair dryer to loosen it up. Be sure to clean off all of the adhesive left behind. Be sure the boat is in a warm area when beginning the install of the new trim. The corners will be the tough part, just your time. A heat gun will help you to be able to bend the trim so it fits tightly without any air bubbles. I had Sherm install mine, but I watched him do it.