07 kia spectra, kenwood dnx7120

Ok I am driving a 07 Kia Spectra and would like to know how to wire this up.. I have not bought it yet but I want to make sure I know all I can before I attempt to install this so as to make it easier on me... I looked up my metra mounting and wiring kit... The only thing  I would like to know, is there a VSS wire on the Kenwood and if so where would I find that in my car?... Everything looks pretty straight forward as far as wiring.... Also is there a page that shows where and how to take off door panels, A-Pillars and stuff with the Air bag installed in them... I would like to hear from others that have taken the door panels off and are there anything hard or difficult about them?

Thanks for reading and I hope to get some help from you guys here....

Thanks again..

JR

Ok sweet so its pretty much a double din install.. Other than running the Antenna.... Thanks now I will buy the 7120 deck...