Unplugging the connections, except for the multicolored group of wires. All are located on the back of stereo should be as simple as pulling on them.

"To remove the group of wires", follow the wires until you reach a connector and unplug the connector.

The thick, metal wire connecting to the radio antennae can be easily removed by pulling on it.

The harness (the grayish female connector circled in red) is what connects the wires to the various components of the car.