That is what I have in my buick, it was a breeze to install. Anyone with half a brain can do it. There should not be a problem as long as you buy the correct harness.
I did not use the harnesses, I got the good 'ol wiring digram out and hard wired mine in with sloder and shrink wrap. Im too cheap to buy the harnesses
If she is so worried about the install, have her pay for a professional to do it.