A cheapo flare tool & bender from harbor freight would help.
Take the original out and match the curves best you can, don't have to be exact.
Like others said, most of the bending can be done by hand, with slow steady thumb pressure, I like the grooved bending tool for starting some of the more complex bends.
You have to flare if you use unions, which you will need at least one if you replace the whole thing.
You should replace the whole line, they are clipped by the gas tank but you can pop the line right off the clips, and don't need to worry about getting the new line back on.
As already suggested, make sure to pad any area of the line the comes on contact with the frame, you could probably salvage the ones that are on the old line, and put them in the same places.