I read every how-to article and post about the subject. Figured I'd add my 2 cents should anyone find this thread in the future. I have a short shifter but don't think it matters.
1 - no need to take apart the knob. I did and I can't imagine it helping.
2 - once you unlock the boot from the shaft by turning 90 degrees as illustrated by others pull and pull and pull. I needed three rounds of pulling to force it off.
3 - putting the new one on goes the exact opposite however make sure you seat the new knob/boot all the way down. I didn't at first.
4 - if you don't see the known/boot completely down the gear shift lever it will be impossible to rotate it back 90 degrees to lock. If you only rotate say 70 degree your are basically allowing the boot to separate from the knob.
5 - if you do separate boot from knob it's not the end of the world, just put it back on the only way it can possibly go on.
6 - you should either hear a slight click or feel the knob/boot sets full. Once that happens you can rotate the boot.
Worked up a sweat doing this in 85 degree weather. Sheesh.
Here are the easiest ways to remove the shift boot and shift knob on a newer Porsche.
To remove the shift boot, use two pry bars from an interior trim piece tool kit ($15 or less) and a flat head screwdriver. It's easier with two people.
On the side of the shift boot, wedge the two pry bars in between the boot and silver trim piece. Then wedge a flathead screwdriver in between the pry bars and twist. The shift boot should just pop out. Here is a picture to better illustrate:
With the shift boot separated from the trim piece, you can now rotate the boot 90 degrees to unlock the knob from the shifter. The knob is just press fit onto the shifter.
To remove the shift knob, you will need two people. Both of you sit in the car, and put a board across your knees. Get a crescent wrench or small pry bar, put it under the shift knob and rest it against the board. Now, simply pry up and the knob will POP off. This should take a medium amount of effort.
To reinstall the shift knob, you simply press down under you feel it "thunk" on.
I thought the only way to remove the knob was to take everything apart but I wasn't having luck with it. I just pulled hard and was able to get it off. No tools required other than my two hands, this was after removing the base of the boot. Didn't seem overly hard or technical to do.
TIP: After removing the shift knob, lightly grease the stick with lithium grease before re-installing.
It will make putting it on and taking it off again easier. Also keeps the rubber on the inside from wearing down each time you take it off.
I just removed mine and fitted a Gt2 rs knob . Took 2 mins . Rather then using a piece of wood etc to lever against. I just took a pair of mole grips ( not sure if you guys in the usa call them that. ! ) basicaly pliers that clamp on . I clamped them on a couple of mm below plastic nut you turn a quarter of a turn , and just levered up with a flat screwdriver ! Couldnt have been simpler .