I rebuilt a P/S pump last week. I found the hardest thing was to remove the circlip. You just have follow the video in the link provided.
shogun also has a link somwhere here showing a diagram layout of the pump in another link that I couldn't find just now. But the video takes care of everything.
There's a lot of items in the P/S kit that wasn't used.
http://lh3.ggpht.com/_PbK4nFh90Kc/S-...0/IMG_6427.JPG
http://lh5.ggpht.com/_PbK4nFh90Kc/S-...0/IMG_6430.JPG
http://lh5.ggpht.com/_PbK4nFh90Kc/S-...0/IMG_6432.JPG
http://lh4.ggpht.com/_PbK4nFh90Kc/S-...0/IMG_6433.JPG