I just recently installed my H11 6000k HID kit on my 2.5s Altima and I have to say it could not have been easier! So I decided to post some tips that might help others.
I should probably start from the beginning by saying that i was very hesitant to do the installation myself mainly because my car is leased and I did not want to damage any part of the electrical system and thereby void my warranty. However, upon getting quotes on installation prices from a few shops around town, I figured its much better to do it myself considering that the lowest quote that I got was $90/hr for a 2 hour job. Even the quote I got from Nissan was huge because they said that they would have to take out the headlight assembly by taking off the bumper and re-adjust the direction of the headlights, which is an utter lie!!!
So upon doing some research, i concluded that there is no reason to take off the bumper. All u need to do is park on a flat surface, turn your wheel opposite the direction of the side you will be working on first and then undo the couple of screws that are holding the wheel well in and ur home free. Once you take out the plastic wheel well, U can simply reach in and pull out the stock bulbs, put in the new HIDs and wire it to the ballast. Then u simply use some 3M adhesive tape to attach the ballast to the top where the bumper meets the body.
Now as for the passanger side, u simply turn ur wheels all the way to the left, again remove the wheel well and replace the bulb. HOWEVER, on this side, you can attach your ballast to the windshield washer fluid since it is adjacent to it. That way, u also warm your washer fluid during the colder months. TRUST ME, this works VERY well. I am in Canada and I have already noticed the difference in the way that my washer fluid no longer smears
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After you are done, just simply put the wheel well back in place and it's good to go! needless to say, it took me a total of 25 minutes to do this and I didn't need to use any of the extra harness cables in my kit as the car is already prewired.
Lastly, you do not need to adjust your headlights IF YOU ARE ONLY INSTALLING LOW BEAMS. The beam height on the low beam housing is fixed and will always point where it needs to. In fact, I have driven by at least 10 cop cars who look directly at it and have done nothing.
Hope you enjoy the tips!