Blue, To self rig multiple pieces all you need are some slings and a tad of ingenuity. One way(but not the only way) is to throw a sling around the piece to be lowered,tie off one end of the lowering rope to the tree up at your level,clip the sling (with 'biner) onto the rope and secure the standing portion of lowering line. In effect you have clipped into a loop of line with one end 'permanently' tied off and the other temporarily tied or routed through a fig eight or a couple of natural crotches so that you can hold it with a free hand or foot but let it run a little if need be. You lower by letting out line,expanding the loop until the piece is down. Then untie the end and you can zip it through the biner and recover an unencumbered line.