GM A body fuel line replacement?

[gtomike1967]

Hi,
I recently bought a 1967 GTO convertible. In my haste to start working on it I ordered a new fuel tank and a new fuel line from the tank to the fuel pump.
I have now realized that its probably impossible to replace the fuel line while the body is on the frame? Inline Tube says its possible but very difficult.

So im wondering what options I have for a new fuel line? I see kits with steel lines and some bending and flaring tools but I have a feeling steel lines might be a little hard for an amateur like me? I have seen some kits with aluminum lines that are supposed to be easier but will require a different type of fitting.
What have you all done in the past? Removing the body or even lifting it is not an option.
Thank you