There are ten screws around the perimeter, circled in red in the second photo. Use a T8 Torx bit to remove these, and set them aside, we'll need them when we're done!

Place your XPS 18 face down on a flat surface. You may want to put a protective surface down such as a towel, microfiber cloth, etc., to make sure your screen doesn't get scratched. I'm using blank newsprint paper which also works great to give us a nice light background for the photos!