I need to shingle one side of my house, not a big area, about 16 m2 total. The shingles are 58 cm long, and I figure a 10 cm overlap is adequate (sorry for the metrics). When I get to the top row, do I cut 10 cm off the shingle so it looks proportional to the rest of the shingles? Also, I won't have scaffolding, just a simple extension ladder, to get the job done. I'm thinking of using a backpack or some other bag I can sling over my shoulder to hold the shingles so I'm not running up and down the ladder as much. Any one have a different solution?