Removing CDR2005 stereo from Vauxhall Nova

[Old Sparky]

This has now been succesfully removed from the car, but there is another problem, which is that I am unable to remove the front panel assembly from the rest of the stereo to replace a defective volume control (Rotary Encoder). The panel appears to be held in place by 4 plastic clips and is plugged to the main PCB, but I fear that if I press too hard on the clips, something will break. Anyone know how to remove the front panel of one of these??