You can cut steel roofing panels with a circular saw and a carbide blade, but it’ll save you a lot of work if you order the panels the right length to start with. Plus, you’ll have a greater color selection if you order the roofing rather than buy off-the-shelf panels. Remember to order in advance, though, since it usually takes several weeks for the roofing to arrive. And make sure the overhangs are the right size so the panels will overhang the fascia slightly.
Working from ladders is more dangerous than working from scaffolding. Plus, having to constantly move ladders around is time consuming. When you get to the roof construction, consider renting a set of scaffolding with wheels. You’ll be amazed at how much easier it is to have a stable platform to work from and to set your tools and materials on. You can rent a 5-ft.-tall section of scaffold with three planks and wheels for about $110 per week.