brake lines

This is a primary safety system on your vehicle. Have it done by a pro.

There should be no need to replace the fuel lines unless they look rusted out as well. Its not hard to replace the brake lines just make sure the flared fittings are the same as the ones you take off and that you don't bend the brake lines sharply casing a kink in the line. After fitting the lines make sure they don't rub on any sharp edges that will cause fatigue or failure.