Suggestions:
Prep the exhaust well. de-rust and paint, to prevent more rust. wrap will hold moisture.
Soak the wrap. its easier to work with.
Wear gloves. its itchy
Wrap from above the collector up to the header on #'s 1,2,3 and secure with stainless zip ties. Do these first.
Wrap #4 last, since its visible and on the outside of your bike.... from the collector all the way to up to the top of the header...so it covers the collector, and hides the start hose clamps for 1,2,3.
Go for a long ride and burn-off all the moisture. itll steam like youre on fire