This description of replacing the memory in the 2018 Mac Mini is excellent - best one on the internet by far. If I could suggest you might make reference to the fact that to remove the six T-6 screws from the antenna plate requires a T-6 screwdriver with a hole at the end, because these screws have a tiny locating pin in the center of the star. I know you say the screw are “security screws”, meaning that this special screw driver is required, but making it a little more obvious might help.