i am looking at installing the Pioneer avh-p4000dvd in my 02 Yukon Denali and can someone give me some help on things i will need and what mods i will have to do to get the system to fit..I have read alot on the forums but i may be a little slow and not catch up on what i was reading..my Cd player conked out on me and the radio is getting too boring..also want to install headrest Monitors in the future for my Daughter..I would really appreciate any info you can give me...