During my ill-fated attempts to install a "Lockpick" in my 2007, I found some very helpful videos that walk you through it. I think the company's name was Coastal Technologies or something?

Try searching on Youtube and you might find it... look for Navigator Radio Removal or something like Expedtion Radio Removal and it might turn up.

Otherwise, dig up their website and they should have links.

I've tried to block that whole episode out of my mind, but their videos were very good.