How do you fit a new stereo in a rover 400?

To fit a new stereo in a Rover 400, start by disconnecting the car battery for safety. Remove the existing stereo by prying off the trim panel and using a stereo removal tool to release the unit from its housing. Connect the wiring harness of the new stereo to the existing harness or use an adapter if necessary, then secure the new unit in place and reattach the trim panel. Finally, reconnect the battery and test the stereo to ensure it functions properly.