Hopefully, you figured this out, but if not...
The facia is held on with some 'push clips'. Using a stiff putty knife, gently pry it off starting from the bottom and then the sides/top.
The radio is held in with 4 screws. There is ample room to install a better head unit and other accessories. I installed a JVC KW-NT500 plus new speakers and a sub and LOVE IT! I left the clips off to allow easy future access.