Here is a link to a post where I talk about removing the roll pin retaining the parking brake knob: http://www.jaycoowners.com/forums/f5...e-30699-2.html
As far as the dash removal itself you need a Torx bit to remove the (I think 10) screws holding the plastic dash cover. This piece wraps over the steering column, around the headlight and cruise control switches, and over the shifter handle. You also have to pop the small plastic bezel off from around the radio/nav. Just gentle outward pressure at the corners of the bezel works for me, no tools required. If you have a woodgrain applique on the dash you may find some of the screws are partially covered and have to carefully cut them out to gain access to the screw, I believe some owners have reported theirs were covered somewhat by the applique. Mine is just the factory Freightliner gray; no woodgrain so it is easy!
The radio itself (if you need/want to take it out) is held in by 2 screws concealed by the plastic dash cover. Once the dash cover is off it is very obvious how the radio comes out. I have had the radio in and out several times to add my Sirius tuner and to install a compact subwoofer located under the passenger seat.
Once the plastic outer cover is removed then there will 3 more of the Torx screws visible holding the center aluminum piece that contains the switches, power plug, etc. Those 3 screws also obviously have to come out. Now is also when you need to remove the parking brake knob as described in the post linked above. Once the parking brake knob is off sometimes you can only pull that center aluminum section out a small distance without disconnecting some of the wiring connections, just be sure you keep track of where things belong for reassembly. That aluminum piece is where I had to add my two extra switch cutouts, one for my foglight switch and a second for my side-view camera defeat switch.
Let me know if I can help with anything, glad to pass on what I have learned!