ok, this is gonna be vague..
disconnect speakers
take out child restraint bolts
take out rear back rest by lifting it out of its clips
pull out
lift up rear shelf (clips into chassis with clips at rear)
pull one side of shelf out towards yourself, then the other will follow
take speaker grills off
unscrew speakers
chuck in new 6 inchers (if 6x9s, spacers needed)
screw tight
put back everything
connect
if thats wrong, someone can correct me