metal brake lines

Well that's number three today and no luck still leaking. Maybe I'm not getting it tight enough? It's a pain to get in there with a 3/8 snap on wrench. I even got the wrench made to help it from getting stripped and to help with stripped when they are.but it feels nice and snug. I even went from finger tight then a little more tightening with the wrench and up to when I can't turn it anymore and no luck. I have one more brake line before I turn into the hill and throw my car through my neighbors window lol. No I'm about to call a mechanic that is abhuddy of my old boss and see what he would charge me to come over and do 5 minutes of work. I just hate spending money whenni know I can do it. I can do almost anything. Just these brake lines are gonna be the death of me