the first time I redid brake lines I used the pre-made straight pieces from the auto parts stores. I used a little bending tool and it was pretty simple. the second time I bought a whole roll and a bag of ends and a flaring tool. it was more complicated for sure (and I highly suggest practicing your flares before you start on the truck), but I did it and if I did another I'd go with a roll.
a quality flaring tool makes all the difference.
also, you shouldn't feel like you need to perfectly replicate the factory bends and routing, but do make sure nothing is going to catch or pinch the lines.
also, also, now's the time to contemplate the dual booster swap with a normal prop valve up front and to delete the rear height sensing valve. more info on those in the link in my signature.