It is harder to adjust the coilover once its on the car, but its doable, not impossible.
Newly designed coilovers have the height adjustment without changing the spring preload and other stuff. So should you change the car's height with collar 2 or 3? It's your choice.
My instruction from the coilover said to loosen the collar 3, then use the wrench and turn the top/bottom collar at location 2 clock/counter-clock wise depends on raising/lowering the car (turn upper collar clockwise to lower and lower collar counter clockwise to higher). I, on the other hand, just loosen collar 3, then remove the bottom mount on the coilovers from the spindles and spin the bottom mounts.
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