Its not as daunting as it all sounds mate.
Best bet is to pop the bonnet and get a look at the backs of your headlights. Try the driver's side first as you'll have the most room here and be able to see what's going on the best.
Pop off the black headlight cover (it's kept on by two clips). Now you can see your bulb sitting in the headlight with the black OEM connection running from it, out of sight. When you have everything fitted you'll need to connect the two spade connections running from the HID to this. Also running from your HIDs there will be two other wires with a rubber grommet along the way.
This grommet is to sit in a 25mm hole you have to drill in the black headlight cover. The wires then run into your engine bay and are connected to the ballast. It might be worth trying to connect everything together away from the car to get an idea in your head how it will all sit when fitted.
The halogen bulbs are held in place by one of the most badly designed, fiddely things I've ever had the misfortune of coming across. Once you figure out
how to pop this off, you can take the bulb out and disconnect it from the spade connections mentioned earlier.
At this stage you might want to wire everything up for a test run to make sure the kit is working.
If you don't have a 25mm bit lying about, you can do what I did and make do by drilling lots of small holes to a rough hole 25mm in diameter..
Pop the wires through the hole and fix the grommet. Now you have the fun task of trying to get the HID bulbs in place with the headlight cover attached.. Top tip is the bulbs can only go in one way. You may have to rotate them until you feel them sitting in properly. Visually check through the lens to be sure.
Once you've managed that, connect the spade connections to the OEM connections, pop the headlight cover on, connect the ballast and double check everything is working again as some of the components are quite susceptible to damage (I had to re-crimp two of my spade connectors).
On the driver side some people like to hide the ballast under the waterpump, but I never bothered as the only time I have the hood up is to check fluid levels.. So anywhere secure and away from extreme heat is fine.
Repeat for the passenger side. You'll want to remove the battery cover this time to give yourself room (some people even remove the battery). There's a little shelf right underneath the cover this time that you can fit your ballast on too
There's probably better ways of doing it all, but that worked for me