Fork disassembly tools
You'll need something to hold the spring compressed, and a tool to loosen the cap from the assembly. These guys can tell you what you need:
http://www.racetech.com/page.aspx?id=70&menuid=57
You could make your own if you have a shop available.
A way to fill it to the proper depth after would be nice too, but you can improvise.
Seal drivers are nice too.
You can do this without $500 in tools, of course the right tools always make it easier.
I would check locally for a good machine shop or motorcycle mechanic and see what the cost to do it right would be, and go from there.