On my 02 its pretty simple, hopefully they did not make too many changes for the 03.
I do not have to remove anything, but for the right one taking the battery out will give you a bit more room.
First, pull the wiring connector off from the back of the headlight and tuck it out of the way.
Then pull the rubber boot off. Now you have access to the clip that holds the bulb in. It is hinged on one side, with two clips that you squeeze to release it. Pull the clip to the side, then pull the bulb out.
Install is the reverse, just make sure you do not touch the bulb and make sure you push the rubber cap back on completely over the end of the bulb.
Hope this helps, it goes quicker than it takes to read it.