I have an 07 Suburban LTZ with Navigation and DVD. I do not have the backup camera. When I put the vehicle in reverse a message comes up on my navigation screen that says "check your surroundings"

As I understand, I can purchase the camera from the dealer or gmpartsdirect.com but how would I go about installing it? I hope to make it look like it came from the factory as much as possible.

Also, I searched other threads but the one I found to be most helpful was way too long (51 pages) and much too jumbled to get answers.