If I remember right it took about a day. Nothing hard about it, just a little tedious. Pull an old line and measure it with a string. Add about a 1/2" to allow for the flares. Cut a piece of new line to length. Flare one end and slip on a fitting. Bend it with a tubing bender to match the old line. Then flare the other end. Don't forget to slip on the fitting on the end before you flare it.