how to change fuel exit hose at tank 450sl?

[miaminikko]

Hi,
I need to change the rubber outlet hose from the fuel tank to fuel damper on my 77 450sl.
Any tips on the replacement job, Ive looked and it does look snug there ,so I may have a hard time getting a wrench / socket up there.
I have ordered the parts and am looking for ideas on someone who has attacked it or a similiar job on another merc.

Can I use a crow foot to tighten up the new hose or remove the old hose?. a flare nut may not work there, I am worried about slippage
what tool would be best?
How tight should I tighten? on the hose fitting?
thanks a bunch
Nick