Weld your new jack posts into place. Unclamp the longitudinals. This is a good time to cut and shape patch pieces to fix any rust holes in your floor pans, or around your jack points. Congratulate yourself on your fine welding job. Have your toolwench run out and get some Chinese food.
Chinese food is excellent food for welding.
In fact, I think that s what Chinese food was invented for. Reprime and paint, if you desire. You probably will. Fit the rocker panel into place. Mark places for new holes.