It's been about a year and half since I flushed mine, so my memory may not be exactly right, but IIRC, the bottom, larger hose is the one that goes to the power steering pump. Do not disconnect this one, as you will need it to keep supplying fluid to the pump. IIRC, the top, smaller hose is the one that returns the fluid from the steering mechanism back to the reservoir. This is the one that you will disconnect. When the pump is running, the old fluid will flow out of this line, and you can collect the used fluid by inserting the end of this hose into an empty container. Since this hose is fairly short, it may be easier to splice an extra length of hose on to the original hose, just to have more hose to work with.
You wil also need to plug the disconnected fitting coming out of the reservoir, to keep the reservoir from leaking. However, there will be no pressure coming out of the reservoir fitting, so it doesn't take much of anything to plug this opening.
If you have a couple of friends that you can borrow for a few minutes, the easiest way would be to disconnect the return lose at the reservoir, have one friend insert and hold the end in an empty container, while you hold your finger over the fitting on the reservoir and pour new fluid into the reservoir, while another friend starts and stops the car and turns the steering wheel.
I hope my memory serves me correctly about which hose does what, but that is the general picture. You're probably going to spill some fluid, no matter what you do. As far as the amount of fluid needed, I don't recall the exact amount, but it's not a large amount. Probably 1-2 quarts will be sufficient to flush out all of the old fluid.
