No offense intended here, but if you’ve never laid a steel roof, or helped lay one, I wouldn’t bet on being able to just walk out and do it. As someone who has laid a lot of roof down, of both types, it is quite a bit trickier to lay a steel roof properly. If it’s just a simple gable roof and you don’t want any of the trim, which is what really helps seal out living things and the elements, it wouldnt be too hard. However, if you intend to do it right with all of the trim pieces, it ain’t that simple. Shingles are far simpler, as long as you cover all your nails and make sure you lay uphill, the things pretty much seal themselves.