I have aftermarket headlights (Vland) which are dual beam, so the dual relay harness is just grounded to the negative battery terminal. Here is a diagram of a HID install with a single relay harness. You should have a dual relay harness, though. I hope it helps!
I installed mine using the cigarette lighter adapter. I ran the wires up along the headliner, down and behind the door weatherstripping, under the glove box, and over to the AC adapter. Can't see the wires at all :)
You definitely need a dual relay harness. I have a 2014 2.0T and I have HID's installed with a dual relay harness. The year of the car doesn't make a difference, you need the harness to protect the circuit.
There should only be one bolt holding the bumper on in that location (one on each side). You need a 10/32 hex socket wrench to get it off. Those are the last bolts you have to remove and then you can pull the bumper apart at the seams on each side.
In the diagram Gerard 2 posted, look at #1 pointing to the bumper cover. See that screw at the very top of the bumper cover? Those screws are kind of hidden under the wheel well. I didn't know they were there until I went to pry the bumper cover off and it wouldn't budge at all. Once I removed...
You need resistors for LED turn signals, that's why they are flashing (it's call "hyper flashing"). Too much work for turn signals if you ask me. I did find a pair of LED rear turn signals (1156) with built in resistors and no hyper flashing that work extremely well.
These are the ones I bought :)
I have 6000k D2H HID's in mine. Those headlights come with H7 HID's, but the D2H HID's...