Springs went in last night! How I did it:
Unbolted the lower control arms in the back, then 'hung' them from the spindle
Placed the jack on the back flange between the bushings & lifted up the LCA slightly (see note below)
Set the spring onto the LCA & rotated to align with the drain holes
Slid a rod through the shock hole & down through the spring, for safety
Jacked up the LCA & properly seated the spring into the frame
Carefully jacked up the LCA & guided the bushings into the frame, close to the mating holes
Carefully pried the rearward LCA bushing to align to the bolt holes, then placed a short & smaller diameter bolt into the back frame hole to 'pin' the back bushing in place
Carefully jacked & pried until the frontward LCA bushing aligned with the hole, then installed the correct bolt & nut
With two bolts in place and the bushings and holes aligned, I fed the correct bolt into the rearward LCA bushing (which pushed the temporary one out) then installed the nut
'Hand tightened' the bolts & nuts (will torque with the wheels on the ground), then removed the jack and 'safety' rod
The process was fairly easy, but for safety's sake, I took my time. It would have been safer and easier with the J-23028 tool, but even without it, it was FAR safer and easier than what I originally tried. And, I did not need a spring compressor.
& when placing the jack on the LCA flange, draw an imaginary line through the lower ball joint and center of the spring, and place the jack about where that line intersects the flange. Reason is that it helps lift the LCA evenly. Otherwise it tends to twist as it lifts, making everything harder / less safe.
Thank you all for your advice & I hope this helps somebody else!