What happens next?

How to install a factory navigation radio into a 2002 2004 jeep grand cherokee 
Start by using a pry tool to pry the radio bezel surrounding your jeep's factory radio out from the dashboard. 
Set it aside, you'll need it later. 
Your jeep's factory radio is held in by four (4) philips-head screws.
Remove them and set them aside, you'll need them later. Remove the dashboard tweeter bezel by using a pry tool and set it aside.