Take another look at the vid, Mel. Notice the cable anchored to the side of the wall the whole way up? It's a climber's handrail. Put on your harness, girth hitch two slings to it, and add one biner to each sling. Clip one biner to the cable handrail. When you reach an anchor point, clip your other biner on the opposite side of the anchor from your first biner. Then detach your first biner from the cable. Walk to the next anchor point. Repeat ad infinitum.