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If you live in the rust belt and plan on driving anything older than 7 years old you will be replacing fuel and brake lines. The sooner you learn to replace them yourself the better, unless you can afford to pay someone. when I take in a job to replace brake lines I am more concerned with weather the bleeders will open than anything else. I have finally started to turn away fuel lines as I work by myself with no lift and at 64 years old I don't need that kind of work. But if it was my own I would still be under there doing it. As far as working outside in cold weather insulated jump suits work and will keep you warm. Suck it up and do it, every time you do it gets easier. Every mistake you make is a learning experience. Experience starts as soon as you start..
I know I may seen like an old know it all but to work for weeks to pay someone to fix something they spend a few hours on never worked for me. I learned to sweat pipes when the plumbing needed repair and to replace switches and breakers when electrical failed. I learned by doing and asking questions, today with the internet and You Tube the answers are a click away.