Josh...if you have the stock airbox. here's how you install it on a 97-03 and it's not much different 04-08

Remove the rubber tube from airbox to throttle body
Loosen two 8mm screws holding the airbox together.
Loosen two 7mm screws holding the connectors to the pcm
Slide old pcm out, and new in
Snug the two 7mm screws
Put the airbox back together and snug the two 8mm screws
Put the rubber tube back in place