HELP!!! OEM gas tank install advice anyone??

[64-454ss]

I'm putting the original gas tank back in behind the seat. Are there any tips for doing this? Putting the tank in is very straight forward, but, looking for the best way to attach the filler neck and grommet. Is there an order I should be following? Looks like I can get everything together ok, except for tightening the clamps on the hose. Should this all be attached before I put it in and fish it up thru the grommet, or just get someone with smaller hands to do it once it's in?
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