I can't point you to a video, but for silkspan, silk, or tissue, put it on wet. Obviously, this means that (A) you have to have doped the fuselage (but you did that anyway), and (B) whatever you're using needs significant wet strength (so, you're fine for everything except some brands of tissue). Putting it on wet will help it go over compound curvatures much, much better. I do this with a spray bottle of water handy, so I can take my time and not worry about things getting dried out.
I haven't used polyspan, so I can't comment other than it sounds like you can coach it around a curve with heat. So those monocoat skills won't be completely wasted.
Cover as big an area as you can with each piece of material. For silkspan or tissue, I like to rip the edge where pieces overlap -- this makes a less well defined ridge when it comes time to cover your sins with dope. I think the principle is the same with polyspan and for silk -- I dunno! It's always been out of my price range. Pinking shears?
Tack the edges of the piece down with dope, and for everything but polyspan, it'll shrink as it dries and smooth itself against the surface of the fuselage. If it doesn't, and it's just a little bit not-tight, sometimes you can re-wet it and it'll dry down to what it's supposed to. Sometimes not -- then you just shed a tear or two and rip it off and start over.