A little clarification:

Assuming you have both trailing arms off, don't tighten the front frame nut on the first one you install until you get the second one in place with a nut on the front and the axle bolts on both arms tight. The reason is if you tighten one side before getting the front frame nut on the other side, you will cock the axle and then have difficulty starting the nut on the other side. The ideal way is to torque the axle bolts on both sides and then alternately snug up one in the front and then the other in incremental steps i.e. 50/75/95/105 lbs. That way, you'll pull the axle into alignment evenly.

Probably a bit retentive, but that's just my engineering mentality and the way I do things. Do it right once (hopefully) and then you don't have to worry about it.