Tim, If you will just go to www.glocktriggers.com
and watch the installation video on the Products page you can see how simple it is. Sounds like you probably already know. If your a fan of the .25 cent job, fine with me. Some people want a complete trigger system with modifications to enhance function. They don't necessarily want to do it themselves. I do encourage everyone to take a Glock Armorer's course to help them understand and be able to work on their own Glock.