using a fine screwdriver, slide down the side of the lock tab, pulling forward.
undo screw behind lock tab and remove lock cover.
using screwdriver/whatever you find that works, remove clip from behind window winder (careful, they fly off like a bullet).
CAREFULLY pull vents out (I removed the side cover first then pushed out with fingers).
remove vent holder.
remove door handle (centre pops out, 2 screws behind).
remove 3 screws along bottom of map pocket.
door skin should now pop off with a bit of effort. be careful, as the clips can separate (no hassle, but they need to be re-joined prior to putting skin back on).
replace speaker. you'll need to cut/solder the wire as holden use plastic looms.
re-fit skin, being careful to sit clips in holes.
use screwdriver (anything) to slip top of skin under rubber window sill.
re-fit parts in order they were removed.
enjoy the new sound.
I think that's everything..... feel free to add in anything I missed