"With the weight of the vehicle"...Question

I just want to verify if how I did this was ok....

I replaced my leaf springs and when I tightened everything up, I did it with a jack holding the rear of the car up under the differential. I assumed that is the same as the weight of the car on the suspension - yes or no?

Reason I did it that way was it was easier to get to the bolts....or is that not correct?

Thanks - Jeff