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Metal roofing does not come with holes -- you either predrill 'em where you want 'em, or if you are like most people you just start each screw with a sharp whack from a hammer and then screw it right thru. You have to (well, OUGHT to) use special self-tapping rubber-gasketed screws sold specifically for this purpose. They zip right thru the metal and wood, and the gasket keeps them from leaking water thru the hole they make. Well, unless you over- or undertighten them. You use a hex-head driver on a power drill, and it goes really fast, the slowest part is just being careful to get each panel on STRAIGHT so your roof edges dont go all cattywhompus as you go along.
You may need a bit of a ladder depending on coop height, but you do NOT need to crawl up on the roof to put the tin on. The best way to install it (if you want to avoid roof-crawling) is to NOT have it on plywood, just put 2x4 stringers across the rafters at two foot intervals. You then screw each roof tin panel on individually (they run from the top to the bottom of your roof and are like 20" wide or something like that) -- you 'pop up' between rafters to get at the 'high end' screws, standing on a ladder where needed. Does that make sense? Then if you want to insulate the underside to minimize heat loss or condensation drips, do it from *inside* the coop, from the underside of the roof.
Pat