Use a very small socket on a short extension, just big enough to fit over the end of the clip to push it down. You'll use your free hand to push the clip over the attachment tab once it's low enough. My first time sucked too! 😉 After you do it once, it becomes fairly easy. Don't use a screwdriver to push the clip down because it can slip and gouge your mobo. Or stab you in the eye. Ouch!:Q