I haven't had trouble using a flare wrench on my lines, just use rust penetrant and clean the nuts before attempting, as mentioned. Use a 10mm flare wrench on one side and a 19mm (or 17mm, don't recall exactly) on the big nut. Go slow and don't let the wrench slip. I'm using braided MSA lines without a problem, just make sure you don't kink them on installation. As far as the "off-road only" tag, it's not etched into the brake lines and can be easily removed. Regardless, I doubt anyone would be inspecting your soft brake lines if you get pulled over, especially if your car is stock-ish (i.e. doesn't look or try to look like a "race car"). Otherwise, inspect the brakes and see if they need attention. Go by the FSM, check for leaks and wear, and correct as necessary. Adjust the rear brakes.