An arbor press is handy... and another set of hands, as far as working it back together.
some pictures of my 2 piece shaft out of the truck... it may or may not help.
Once ya get it back together, it is fairly simple to reinstall.
I had an issue on mine, once I had it installed about the grease fittings being hard to get to with my grease gun. I've been told there is a madness to how the joints going back on 'just so'. I'm not really sure what that method is tho'.
-W