I would be very interested in seeing pictures pointing out the most problematic areas that you encountered. I've always liked to do my own wrenching, but I've never done a suspension. I want to do this one myself, and some pics would help me see what to look out for.
Here's a link to the approach I used:
OME Install - no spring compressor - Toyota 120 Platforms Forum
So the method I used to to avoid having to have my coilovers assembled as follows:
Open KDSS valves 3 turns
Loosen lug nuts
Jack up front end and put on jack stands
Remove wheel
Remove top bolt of the shock
Remove nut from the bottom bolt of the shock
Put a jack under the LCA by the ball joint and remove the 2 bolts under the hub
Support the hub with either a 2x4 or ratchet strap. Take time to get this set up, otherwise you can pull the CV out of place.
Lower the jack to lower the LCA from the assembly
Mark your LCA alignment tabs
Loosen you LCA to Frame bolts
Hit the bottom shock bolt all the way out and the LCA will drop, as will the shock and coil
Takes a bit of finagling to get the new stuff in. A person to help is critical. 1 person to hold the shock and coil in place while the other cranks down on the LCA so you can seat the bottom of the shock. Another thing that helped a bit if it feels like to much monkeying around is to put the jack under the spring, jack it up enough that you can put the top nut on the threads to hold it in the top hat, then you're just fighting to get the bottom in. Once that's in and you jack everything up, undo the top nut bolt and add the bushing and washer.
Once the bottom in seated, don't bother trying to put the bolt in
Jack the LCA up till you have enough thread to unscrew the top screw and correctly put the bushing and washer and nut on the top of the shock. Tighten
Once the top is locked in, jack/lower the LCA to be able to fit the bolt through the bottom shock. It takes a little wiggling but it's pretty easy. Hand tighten nut.
Once that's all locked in, jack up the LCA to connect the 2 bolts under the hub assembly. This is another 2 person job. One crouched over the hub assembly guiding and the other jacking it up.
Attach bolts.
Check your alignment tabs and adjust and lightly tighten to hold them in place.
Put wheel on, lower to ground.
Torque Bottom Shock nut, top shock nut, LCA alignment nuts.
Head to the other side