No, on two different cars, both LS's. The kits come with camera, monitor and cables, there's very little wiring to do.
This is one I fitted about 6 years ago, now they only cost about £18, and this is me not running my dog over!
Yes, although the layout is slightly different. I managed to just about get in to tighten the bottom bolts as well, surprisingly I still have all knuckles intact! I think there were 9 bolts each side, at least that's what I managed to access.
In the past I've fitted two reversing cameras with the screen stuck to the corner of the dash and they've been brilliant, and only about £20! The image is crystal clear and even works well in the dark, plenty on eBay.
As it wasn't raining today I decided to replace my spark plugs, not the nicest job but done anyway. When I was doing it I noticed the rocker covers were leaking oil, by leaking I mean an oily misting. When I checked the cover bolts they were only just over hand tight, so when you're next under the bonnet it may be worth checking yours.