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.