4. Loosen the 17mm strut top nut while the strut is still mounted to the car. Especially if you're using hand tools, this is the critical step I missed.
5. Mark the orientation of the strut mount. Mine had an 'M3' on the mount and I simply marked the strut tower with an 'M3' to match.
6. Remove the three 12mm strut mount attachment nuts. Note that if you're car is like mine, the passenger side strut mount attachment bolts have the horn mounted on top with two additional 12mm nuts. Note that the horn bracket nuts are non-locking and the strut mount attachment nuts are locking and you will want to make sure you use the right ones when you reassemble.
Picture of left front strut tower showing strut top mount with 12mm nuts removed. Note the bast*rd 17mm nut in the middle of the strut top that you should break loose while it is still on the car.