Yup, all you need is the double din deck and the double din kit and a little bit of time and you'll be set. You will also have to cut/trim/dremel out the center part of the radio surround piece to fit the new double din cage (super easy).
The great thing about the din kit is that it comes with wiring harnesses that will plug directly into the factory harness so you don't have to cut and splice anything.
Also, if you are keen on having the DVD playing while the car is in motion (which is illegal in some states) you will need a standard 12v relay and some extra wire.
http://www.youtube.com/watch?v=lDGZEZrUdRo
Have fun! It's a great project to do. I installed the P3300BT in my 02 Boxster in a hour or two.
Cheers
Mark