The only remotely difficult part of this is removing the instrument panel cover, which is pretty straight forward; although there are several "disconnects" to make.
Lower the steering wheel (tilt), and put the shift lever in lowest position.
Pry up on lower edges of panel nearest the steering column on both sides to detach the clips at those notches there.
Pop loose (use an appropriate tool) the clips around the edges of the panel, including sides & top. (if any clips come loose, note where they came from because I believe there are more than one kind & you want to get them back in the same place... this will probably not be a problem, but thought I would mention)
As you gently pull out on the panel there are more clips to release to the left of the radio & above/below the speedo area.
Next you just disconnect the electrical connections. (be sure to note all of them so that you don't get it all back together only to realize you missed a reconnect... that's always a bummer

)
Now you just replace the switch (which is still attached to the panel you just removed), and put it all back together. Have Fun!
If you're lucky, someone may post an image of this "Instrument Panel Removal/Installation" I'm looking at. Or better yet, if you search the forum for "Service Manual PDM", you'll probably find a link to a member that will send it to you if you PM him. Then you'll have all of this stuff for future reference as well. I'm looking at a hard copy or I'd just cut & paste for you.
FYI, I have given you the procedure for 2006 RTL.... I presume it would be the same for you.
Good Luck.
Late Edit: It occurred to me to mention that you'll want to consider confirming this is the switch causing the problem before you fully reinstall. It's possible (I wasn't clear on your symptoms) that you may be having a problem with some other switch/controller; but it sounds generally like you're probably addressing the right thing. Just test it when you get it connected, but before slamming all of those clips back home.... it might save you some effort if you want to move on to "plan B".