I am an old Newbie. A retired mechaical engineer who just bought a XD 45 compact and a XD 9mm sub compact for me and the wife. Want to learn more about these guns "Do's and Don'ts. Both hae Trijicon night sights. Got the Blackhawk holster and really like it. Would like to get another one. Thinking about adding Crimson Trace and a light that will work with the Nighthawk holster.