I need to replace a section of my second story asphalt roof, which has a 9:12 pitch. I’ve only replaced a few roofs which were either one story or 6:12. I plan to use roof jacks and a harness/anchor for safety, but after watching videos and doing research, I know how roof jacks work but don’t know how to avoid them getting in the way. Obviously, they can’t be overtop the shingles I’m removing, and they can’t be on the decking where I’m about to install new shingles. Am I supposed to remove the lower roofing from the ladder first before I put them down?