This is kind of a quickie, but will hopefully be of some use.
1: BEFORE jacking the car up, loosen (
BUT TO NOT REMOVE!!!!!!!) the center strut to mount screw as seen in the picture.
2: Jack up the car and take off the wheel.
PLEASE PLEASE PLEASE use Jack Stands for this!
3: Start out by unscrewing ANY and ALL wires/hoses/lines that are screwed onto the strut assembly. In my example there is both a brake line and ABS line that need to be unscrewed.
4: Chances are, you will need a breaker bar. Unless you want to get a hurnia, which I almost did......Bloody hell that freaking sucked. USE A BREAKER BAR! Like $20-$30 at most auto stores. Unscrew the 2 nuts as seen in the picture below.
5: Unscrew the top 3 screws as seen in the picture below.
6: Now it's time to disassemble it.
PLEASE ONLY USE STRUT COMPRESSORS THAT ARE HELD ON AS SHOWN BELOW FOR SAFETY! I've heard of WAY too many cases where one has come off and the spring has flown off and caused some massive injuries. So make sure it has some kind of thing such as below to hold them on please.
Screw the compressors down until there is NO pressure at all on the mount. In other words, you can freely move the spring around and not touch the mount.
7: Unscrew the compressor and compress the new spring the same way as this one was to be remove. when putting the new spring on the strut, make sure the bottom end of the spring sits securely in the notch in the strut as shown before.
8: Line the grove on the mount up with the notches on the tip of the strut screw. You will know what I mean when you see it in person. Twist the strut mount around until you are 100% sure it is seated correctly on the notch. Then screw the center nut back on.
9: See that the Strut mount and plate are aligned correctly as show below. The plate needs to be correct when the spring is un-compressed, but the mount can be moved afterwards.
10: When mount is secured and screwed on, un-compress the spring and look everything over and make sure all is lined up correctly.
11: Then reverse the steps to get it back in. When everything is back, wheel is on, and car is back on ground, go ahead and tighten the 2 Strut Mount nuts to the recommended Torque specs. Then do the same for the big center nut.