Not difficult to install overall. Instructions are wrong on one step. the tip top of the roof  (Piece marked 'K') blocks some of the roof panels from being installed.   It should be installed after all of the angled roof panels are installed. That way you can still get up there to line it up and screw it down. After that finish off the square roof panels of the top roof layer, and you're good to go.

Took three days of ~7 hours a day to complete solo, with light help to hold up specific parts while screwing them together.

One recommendation is to not tighten any bolts until all similar pieces are in place so you have slack to line up the other bolts.