Update 10 years later: This shit is old and outdated.
I'm not a good writer. Watch out for grammar and spelling errors.
You need some experience with PS if you're going to use this.
Some parts of the tutorial may be odd or incomplete, that's because writing to a text file while taking screens and creating the image at the same time can be a bit confusing. :S
I just pasted the text and screens on this big one after I finished the image.
Anyways, I hope you learn something from it.
EDIT: If the final image looks ugly or odd. Remember to set your screen brightness and contrast to a much darker value. I always seem to noticed how much uglier my images look when I switch between my computers.