Hi, the kit I installed was really easy as all the conectors will only go on one way, you need to drill a hole through the plastic headlamp backing cap big enough for the conectors to go through, on the loom attatched to the bulb burners there will be 2 male spade conectors that plug into the female conectors that used to go onto the H7 bulb, the other conectors on the loom to the balast will only go on one way.
It is important that the hole you drill in the headlamp backing cap is only just big enough for the conectors to go through, this should mean it is a good fit for the gromet that should be on the loom so it keeps the headlamps water tight.
You need to secure the balasts close to the headlamp, I used small machine headed screws through one of the unused holes on the inside of the inner wing.
Do you really have 8000k bulbs, they are almost purple..? 6000k is the normal type