[Rwillia4]

To do the back ride height, jack the back of the car and put on jack stands.
Take off the back tires, then undo the shock lower bolt, this will take the load off the spring. Note that you have to have a jack available to get the shock bolt back in when you have done the adjusment.
You could buy a special tool to do the spanner OR use an adjustable pliers (channel locks) rotate the spanner nut DOWN.
I was just shy of 2 fingers (1.5 fingers) I rotated the spanner 10 times using the 1/4 rotation space available (not ten full rotations).
I would guess the return for adjustment is just over twice the rise at the wheel from your adjustment, so if you put 1/4" change at the spanner the ride height will be at LEAST 1/2".
Once you get everything back on you should take the car around the block to let the suspension settle.
It took me a few times to get it where I liked it.

Good Luck,
Rob