It's pretty straight forward as o2batsea said. It's worth noting the position of the drop arm of your current one when the steering wheel is centered. I believe the steering box itself is "centered" 3 complete rotations from the max right. It can be centered after it is installed, before you hook up the drag link and after you hook up the steering column (simply max it out all the way to the right, then spin the wheel back 3 turns). It can also be done with a pair of pliers before the box is installed.
Hook everything up, then bleed it. Don't open the bleeder more than you need to, or you may experience the full power of a power steering geyser.