Service Ride Control FX3

[tomtom72]

I have a question about installing the rear shocks on my 90. The Helm FSM says:

"Hold the suspension at proper trim height using jack stands." that's step 5.

In the "important" box, with the ! in the box....it says:
"Hold the suspension at proper trim height when tightening shock absorber upper bracket bolts (76). Do not allow the suspension to move below rebound."

I understand this to mean "do not let the suspension hang and use the top mount bolts to take the stress of the weight.....do I have that part right??

Also, do I have to measure the distance from a point on the rear bearing hub to a point on the frame to determine "proper trim height" ? Am I over thinking this? I was just gonna put the rear up on stands and put my jack under one knuckle at a time and jack up a bit to unload the shock, remove shock, put new shock in place and use the jack to get the upper mount back up to the frame before tightening the mount bolts....any ideas???

TIA

Tom