As far as time goes, your first time will be a pain the @ss. I've taken mine apart to change to platinum faces as well as a hyper white bulb color. But after the first time it becomes increasingly easier.
There are a few screws that need to come out, then to actually get in there you'l need to take out your center dash where your cd player goes. Behind the a/c faces are two screws that need to come out to pull back the center piece of the dash, which gives you full reign to getting at your gauges and behind.