Right,

I just did this procedure in my Mk2 Rev 2 Turbo and here are some pointers and things that I found:

I installed a set of Infinity 60.5cs kappas using the stock locations

For the tweeter: unclip the pod that covers them from the top with a flat bladed screwdriver.

I used a pocket butane soldering iron torch thing to heat up the screws

(remove the foam under the tweeter first unless you like the smell of burning plastic)
Once the screws are good and hot

(take your time heating them up takes a min or two) get a really good fitting Philips head screwdriver

(I used a no.

2 Snap-on) and with a helper applying pressure to the outside of the door

(to keep tension from the door mechanism) lean on the screw driver and slowly twist them out.

They REALLY don't like coming out but with enough heat and patience they will

(I promise)

The screws are in a pattern like a triangle and the two that need to come out are the topmost and the one that is closest to the back of the car

(on both sides)

Once the screws are out the tweeter bracket will fall into your hand!
On the back of the bracket is a lone screw that holds the tweeter in it is adhered in but with a good screwdriver, the adhesive will snap right off.

I used the infinity tweeter cups to mount the tweeters and then put it all back together.

For the mid drivers:

I used both the thicker plastic adapter AND one of the thin metal adapters to mount the speakers.

I had problems getting the basket into the factory opening and would rather hack up a set of adapters than the car.

Once all was mounted

(including the crossover), I found that the door card would not quite fit with the new speakers in place.

Using a Dremel tool and a rough sanding drum, I trimmed the plastic ring behind the factory grill to clear the baskets of the Infinity's

Button it all up and enjoy your new sound!

Oh yeah rather than hack the factory wires I hacked the plugs off the dead OE speakers and soldered wires to them to run to the crossover then if I need to replace the speakers again to OEM I can just plug them back in!

Mike