Hope these step by step assembly notes help.
For my Freedom v2 stand I did the following. Less than an hour from opening the box to completely setup.
(should be somewhat similar for most other stands).
1 Assemble the base and long bar for 3+1 (or the short bar for 3 wide only).
2 Slide the 5 part crossbar down to roughly the height wanted and make snug (not locked tight yet).
3 Mount the center monitor to the bar using the non vertical adjusting mount.
4 Measure the distance from the monitor to the desk and remove the central monitor from the cross bar.
5 Adjust the final height of the 5 part crossbar and lock it down tight.
6 Remount center monitor (do NOT adjust it yet).
7 Mount the 2 side monitors (using the vertical adjusting mounts) and swing the arms roughly into position allowing the crossbar to sag whatever amount it's going to in the final setup.
8 Now adjust the central monitor to be vertical and exactly centered & tighten the adjustment lock screws.
9 Adjust ONE side of the arm & monitor to the angle you want it.
10 Adjust that side monitor to be vertical and tight up against the center monitors side bezel.
11 Use the mount height adjustment to raise that side monitor to exactly match the center monitor height.
12 Now adjust the 2nd wing. Start by mounting the 2nd side monitor the exact same distance from the end of the 2nd wings arm as the 1st sides monitor is.
13 THEN adjust the 2nd wing and monitor to match the first side.
14 Finally, adjust the height to match the 1st two monitors.
15 If using a 3+1 setup, attach the top mini-bar, then the 4th monitor and adjust them as desired.