Rubber fuel line replacement questions

[Hook'em]

I have a leak in the rubber fuel line between the tank and the fuel pump. I am not much of a wrencher, but rubber lines and clamps are generally something with which I am proficient. My questions: (1) how much gas in going to be in the line when I remove it for replacement? (2) is there something i need to do to avoid draining a full fuel tank all over my driveway when I do the replacement? (3) any tips that would help me do this repair effectively and safe?

Thanks in advance.