Hello Adam,

First, Congratulations!

Second, No. You do not need to get behind the dash, and thats a good thing. You wind up pulling the head unit out, adding a Y connector and putting it back. You then run a small conduit of cables to the back where the receiver gets mounted under the rear heater controls.

There weren't any gotchas. I would probably never have attempted it without the awesome instructional DVD they include.

Good Luck!