Cut a hole in the wall (see the tree in top center: those grow outside). This is for the stovepipe. I tell you, it's hard to cut hole through the sheathing, bigger than the hole through the metal! I hope that's the hardest part of this!
Spreading the last layer of liquid-applied shower waterproof membrane. I had just enough! It was like the widow's oil (Bible story, where God supplied, as much as they needed, until they ran out of places to put it)