Very handy. Thank you, Mr. SG.
Other than that, my questions seemed mostly met with a puzzled, vacant, vaguely cranky, straining-to-be-polite-to-the-customer-because-I'm-basically-a-nice-guy look, as in, "Lady, why are you making this harder than it has to be?"
Or perhaps it was, "Lady, why don't you ask your husband?"
Or, to be fair, maybe it was merely, "Lady, I haven't had my coffee yet."
For example, when I asked about using a drip edge, he responded, "Well, I guess you could use one. Most people just slap the sheet metal on there and let it overhang. The overhang is all you need to keep the rain off."
Well, that may or may not be true, but I didn't want a huge overhang because I just don't like that look. I didn't want to get into a discussion about the aesthetics of "long, unwieldy, trashy, half-hearted overhangs that look like an afterthought versus short, neat, tidy, trim overhangs that look like you care about good things in the world like, for example, beauty" with him, so I let it pass...and loaded the drip edge on the cart anyway. Mr. SGuy didn't go so far as to shrug openly when I did so, but I could see that he was apathetic about my choice.
And he did answer other questions, such as whether I needed supports under the sheet metal ("Not really. Most people just screw the sheets to the studs and skip the supports underneath."), and which ridge cap to use.
By the time I had checked out, I was feeling vaguely nervous about both the project and about my own general can-do-ness; nevertheless, I loaded the material onto my trusty trailer and headed home.
I need not have worried. Easy. As. Pie.
Here is the process, explained below, with photos for reference:
I then cut all the sheets to length. See my earlier post here.
Once the first sheet was tacked on, I followed it with the other sheets, overlapping each by at least two ridges, and clamping each down until they were all positioned the way I wanted them:
The only other counsel I would offer about roofing is to make sure that any edges that have to overlap (as in drip edges, or shingles, or whatever) are "shingled" so that water runs down off one onto the other below it. In other words, the lower piece of roofing material is always underneath the higher piece.
And there you have it, a weather-proof shed, just in time for the next snow: