You are right there is a gentlemen that does do the installation and I think uses a better projector than our Subaru model. Here is the deal however. If you get the headlight bucket out all you do is drill a hole around 7/8 to an 1" in diameter and remove the H-7 bulb, install the rebased H-7 HID bulb and also find a suitable place for the ballast. The OEM wiring harness is used plug and play so unless you wish to go with relays (not necessary in all the kits I have installed since the transition power spike is a very short duration) you are done except for reinstalling the headlight bucket which is easy to do and then the bumper. No one but a stereo shop will do this for you and many have experience doing HID installs.
I would suggest that if you want turn key try a good shop. I would go 4300K and no higher than 6000K. 4300K is the default Kelvin number for all OEM setups and 6000K is a more bluish tint to it.
Use quality components. Typical HIDs last 3000 hours before a bulb change is required. I used Morimoto purchased from TRS because I read good reviews on HIDplanet about them.
Hope this helps...