First jack up the rear of the car and place jack stands under both sides. You need to jack up both sides to unload the rear sway bar and allow more downward movement of the suspension.
Remove rear wheel.
Place your floor jack underneath the bottom of the rear spring perch and fully load the rear spring. Attach three zip-ties around rear spring. Lower floor jack and remove spring.
Here is the spring zip-tied and removed from the car.

Next you will need to use you spring compressors (Available from Harbor Freight $30) to remove the zip-ties for reuse.
Removing the straps from OEM spring.

Then use your spring compressors to compress your new spring and add straps to hold it in a compressed state.
New spring compressed and zipped.

Ready for installation.

Look at all that room!

Use your floor jack to fully load the spring. This will release the tension on the zip-ties and allow you to reach in and remove them. Done! Lower the floor jack and proceed to the other side. Total job this morning took about 1 hour start to finish.
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