Can anyone tell me how to remove the front door trims on a 2002 Astra without damaging anything? I am fitting new component speakers. I have bought some adapter rings already. I am also thinking of putting an amp in, probably under the passenger seat. What is the best route for the power lead to the battery? I can't see any obvious way in through the bulk head. Someone suggested I go in through the gear selector. Is there an easier way?