This was pretty darn easy to do. Keep in mind on my car 2003 4.4 I didnt have to take the vent off under the passangers glove box, just worked around it.
This took a total of 45 mins!
The DIY explains it all, read the directions 3 times before you start and you will see how easy it will be!
Juts get some icy hot for your back the same night