its pretty simple to retrofit your headlights. You only need 3 basic tools: Electric Driller, Screw Driver and an Oven. Took me about 1hr (on my 2nd go, but 3hrs for the first time). Unlike most people who Installed HID on their stock headlights (designed for normal Halogen Bulbs), they have to point the headlights as low as possible to reduce the glare and they will not have even light distribution.
Back in the old days, I used to have HID on my stock headlights, it was nice and bright. After using them for couple of weeks I decided to take them off since it wasn't worth the risk of blinding oncoming traffic, or worst, causing an accident.
wow 1 hr!! That's really fast!
I took mine slowly, about 1 months worth of weekend work. My hole was actually quite large and i used a dremel and I had to make it perfect (but its still not perfect). But it was fun and worth the results!