passenger side HID
last night i noticed that my passenger side HID was discolored. when i first turned on my lights, i saw a consistent blueish beam/line in front of me. yesterday, i noticed that the left half of the beam/line was blueish (normal) and the right side of the beam/line wasn't blue, but more redish. i got out to look at it and it didn't seem as if the HID was out, but maybe starting to fail. this morning, i pulled into the garage spot and i noticed that the right side redish light was missing from the beam that shines on the wall and when i got out of the car, i was able to confirm that the light was out. maybe it finally died or maybe it turns on/off on its own while it is getting ready to permanently fail.
my questions are:
1- how can i confirm if it is the ballast or the bulb?
1a- if it is the bulb, are those easy to change? i've changed standard bulbs, but never an HID bulb.
2- how easy of a DIY project is this? i realize this is a relative question, but i figured i would still ask. i don't do my own maintenance and i know that some of the ballasts are located in areas that require bumper removal, etc...
3- if i do this on my own or have a shop take care of it for me, does it make sense to change out the driver side ballast (assuming it is a ballast) while they are changing out the passenger side?
i will browse the forum, google and youtube, but i figured it would be a good idea to ask, as well.