Fitted mine today - fairly simple. Picked up the feed for the reverse light behind the drivers side boot trim (near rear seat belt upper anchorage point). Just hooked up the brown wire as described in this thread (which is the reverse light feed) to the red wire in the sensor kit, the black wire in the sensor kit just connected to an earthing point also found behind the trim. Simple as that for the electrics.
As for the fitting the sensors themselves, once you have the rear bumper off (take your time) you can see on the inside of the bumper guide markings for where to place the factory fitted sensors, I just used the guide for my drill location and to fit my eBay sensors, they are in the perfect place.
I have a
NHB Civic and the sensors come in black. I did buy some paint before the sensor kit arrived but decided not to use it when I compared the prepainted sensors to the car - they are black and an exact match.... I couldn't be happier
Once fitted you cant tell the difference between the eBay ones and the genuine Honda ones - and for £17.99 fitted it does not get better!!