lay inside the trunk facing up... look around each speaker and you'll see 3 philips screws... take 'em out. Then inside the car lift off the grilles and you'll see 4 bolts holding each mounting plate in... take them out and swap the speakers on the plates. The hardest part is re-aligning the grilles with the holes and screwing them in... make sure you have someone to help you hold them when you get to that part.