I need assistance changing out a broken a/c vent nearest to the steering wheel, center on my 2007 Chrysler Pacifica! Diagrams or video would be helpful!!!

 

Go to chryslerparts.net and search for your part. They have diagrams there. After your jaw drops to the floor from the prices, consider going to a local junkyard or u-pick-it place to find a replacement part.
Those things usually pop in very easily and can be popped out with a plastic trim tool which are inexpensive and worth their weight in gold when working on interior trim pieces. Alternatively, go on eBay and find somebody who is parting out a Pacifica. He won't be advertising that part but he'll be glad to pull it and sell it to you if you write to him and ask.
If you can find a replacement part, look at it carefully to see how it's held in place, then carefully pry out the old one and pop in the replacement.