It's not hard but it is intimidating. You can also damage the side plate or bung up screws if your not careful.
FWIW, when I did my first one, I got a S&W revolver Smithing DVD ( $15, off Ebay ). I'd highly recommend it. If a picture is worth a thousand words, a video is worth a million. It will guide you through the process and pitfalls while giving you the knowledge and confidence to do it right. Beyond that, get a good screwdriver set and a fine polishing stone or two. ( I use a Lansky knife sharpening stone set.) All in all, the cost of the DVD and tooling can be under $50 and you'll be set up well for the future.
Lastly, a large clear plastic bag is a very handy thing to have on hand when working with springs. I do much of my assembly/disassemble inside the bag to capture small launched parts.