I've got a Geo Metro aluminum valve cover and new rubber gasket ready to be swapped into my 88.5 Samurai (which currently has a stock valve cover). Where do I begin? Has anyone done this swap before? Does anyone know of a good how-to article or picture tutorial on the internet? Does anyone have any good pictures or video of this swap?

I've heard that this swap is fairly easy but I just want to make sure I do everything right. I'd appreciate any good advice from those who have experience with this install. THANKS!

Take the hoses off the old cover, unbolt it, remove it, put the new one on, bolt it down, reconnect the hoses.  Really, that is pretty much all there is to it.
All the ones I have swapped have been onto EFI samurais, but yours should be basically the same.