rear view mirror install

Hi, I am planning on purchasing a 2014 Mazda 3 S Touring. It does not have the auto-dim mirror as standard equipment. Is it worth to get it installed at the dealer? I was told that they would have to remove the headliner for the wiring and stuff. If anyone has had any experience with a...

I'm picking up my Mazda5 Grand Touring next week and I'd like to add the homelink rear view mirror. Problem is the dealership wants to charge me 120 to have it installed, which seems a little nuts. I'm handy and can DIY most things, but I'm not sure what's involved seeing I haven't had a...