How do you change brake lines?

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What if the bolt is round? there a special tool for that? hehe, j/k, I stopped when I saw my wrench turning and not the nut <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wow.gif" border="0" valign="absmiddle" alt=':0'>
So where do I get this magical wrench that won't strip my nuts down to nothing? Just the local auto parts store?

Also, the rear's seemed easy enough to get to, just take the wheel off and it's sitting right there...I haven't looked at fronts yet thought so maybe they are ridiculously easy <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/laugh.gif" border="0" valign="absmiddle" alt=':laugh:'> yeah...right.

Another question, which direction do I turn? Do I want the nut to screw UP higher on the hard line, or down off the hardline? I noticed the hardline flexes a little when I was trying to do it earlier...I'm kinda worried I'll break it or something, is this a risk or am I just paranoid?

Thanks for the help!