I replaced the rear lines on my 92 1.9l. I cut the lines about under the drivers seat - as they were unrusted from there forward, and put on new nuts and then put a double flare on each line. From there back I used lines from the auto parts place, bent using a cheap tubing bender (or my hands), and where I needed longer chunks than they had, I used a coupling to join lines. I also replaced the two rear brake hoses, and the short lines from the brake hoses on the axle, out to the wheel cylinders.
Aside from dealing with some red ants, the work wasnt difficult. It was time consuming though. I had the back of the car jacked up and set on some wooden supports (6 x 6 lumber pyramids). About the hardest part was getting the original clamps that supported the lines, to unbolt from the bottom of the car; rusty of course.
I also dropped the fuel tank, to replace the fuel pump (car had 200k miles on it) and to replace a rubber connection hose between the tank and the filler neck. It was split and leaking.
My single largest expense was the double flaring tool - but I knew I would be using it on a couple of my other old cars.
If you make your own flares, you need to be using a 'double flare' tool.
I dont know if compression fittings work okay in the long run - but I am pretty sure the federal laws dont allow them.