^^ so you've got a few options here.
let me start with plug and play. i made it plug and play by not cutting any wires and spending some extra money to get a wiring harness.
so you already have HID's from DDM, now you need to pair your current (idk what bulb size you have) to a projector. OR! your can get new bulbs from DDM, idk, but i think they are like $15 for new bulbs and then plug in your new bulbs into your existing ballasts (maybe e-mail ddm and make sure that you can pair your ballast to the new bulbs you get). This is something you will have to decide based on your cost. if the projectors cost more for your current bulbs, then you may want to consider getting new bulbs and get the cheaper projector.
these are the projectors i got because they were the cheapest and got ddm DS2 bulbs
http://www.theretrofitsource.com/produc ... cts_id=236
here is part 1 of a 2 part video i watched to get some more info and see what i was getting myself into (also watch part 2 it should link to it in the video)
https://www.youtube.com/watch?v=2UMlUfBbc1M
Just note i did no cutting to the headlights because the projectors i used were small enough to fit in the stock diameter.
the wiring harness i used was
http://www.theretrofitsource.com/produc ... s_id=14032
so this attached to the battery, to the ballasts, to one of the stock headlight lightbulb connecter (so they harness knows when the high beams are on) and to the projector mechanism that flips that wall to let more light on or off based on if your high beams are on and off.
This is the shield i got
http://www.theretrofitsource.com/produc ... ucts_id=66
i got the value shield and saved $15. so the total cost of that was $15
it wasn't too stressful for me to do this retrofit because i planned out the design beforehand, and then got a set of aftermarket headlights (right and left) for $30 so i could work on the lights and still use the pathy as my daily.