I've already installed a set on my XD9. It wasn't too difficult at all. Just took a little prep and patience. I installed wood blocks on my vice so that I wouldn't chew up the slide. I then removed the slide form the gun and dropped the barrel and spring out of it. Locked it in the vice and took a punch and knocked out the front sight. It was a steel punch but I wrapped the end once in thick duct tape so that it would not touch or gouge the slide. XD's are know for how tight their sights are installed. It took a couple whacks but I got it out. The rear sight came out easier. Maybe I had just gotten up some more confidence. Installed the Tritium sights just like the same way the old ones came out. Youtube is your friend. If you want to find out how to do something, there's usually a tutorial on Youtube to follow.