Hey Guest!
Like one of those metal-wire puzzles I got for Christmas - seems like it won't go until you suddenly find that sweet spot and everything falls into place.
If you have seen the videos then you probably have a pretty fair idea of the sequence.
One thing I did was cut a notch in the fill hose rather than shorten it to get a good connection to both filler and tank:
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Now looking at my notes -- I see that the grommets didn't want to stay put as I maneuvered the tank into position. To remedy that I tied them in place using dental floss.
Floss is quite strong yet thin enough to not interfere with the bolts. When all is buttoned up it is slippery enough to slide out after being cut loose.