After rolling the edges you final drill all of the holes, remove the chips generated by the drilling operation, debur the exposed holes and then re-assemble with clecos. When installing the blind rivets I would start at the middile of a section and then work my way to the ends, alternating sides.
Drilling Right Elevator Leading Edge Using 12" Long # 40 Drill Bit
Drilling Right Elevator Leading Edge
Squeezing Blind Rivet to Secure the Right Leading Edge
