Here's my steps ... (others have their own way ...)
1) remove the anti-sway bar (if you haven't thrown it away yet)
2) jack the a-arm up (you'll need access to the 3 nuts below the ball joint so get jack positioned carefully!)
3) undo the strut mount (and strut shaft nut if your going to flip the mount).
4) remove the nuts holding the ball joint and swing it out from under the arm.
5) lower the arm slowly, and spring should fall out.
Reinstall by ...
1) Get your spacer and spring properly positioned up top, and set in the recess at the bottom best you can.
2) Start jacking the arm back up. This is tricky cuz the jack will wanna slip (and you need it be clear to get the ball joint back under). I've used 2 jacks before. One to get the spring compressed into the arm, then a bottle jack to hold it there while I remove the other and get the ball joint mounted back under the arm.
3) Get the ball joint under the arm and bolts snugged.
4) reattach strut mount (and strut shaft if undone earlier)
5) torque everything properly!
Be careful! That spring has considerable forces applied to it.