Lots of penetrating lube and a special wrench, I forget what it is called but it is specially designed for the types of nuts that go on lines like that.
It is a open end wrench with a smaller opening so it goes around more of the nut so you dont strip it.
Damn it I wish I could think of what it is called.

Bueller? Bueller? Bueller?

 

http://www.sears.com/shc/s/p_10153_1...yword=wrenches

Flare nut wrench.

 

Ooh, those are some neat wrenches. I can't figure out how to get the lower cooler lines (engine oil and what looks like power steering fluid?) back on. Also I'm going to loose a lot of power steering fluid, what should I refill with?

 

The power steering on a DI uses Dexron III.
So any name brand Dexron III.