Photoshop is pretty difficult. The reason is because there's SOOOO much information and SOOOO many ways to do things within the program.
This particular method consisted of about 12 layers. I started out with 6 copies of the same photo at different exposures and went from there. Basically, an HDR; but, not... If that makes any sense.
If you have an interest in learning it, I recommend 'CS2 For Dummies'. It combines the basics with some cool tips, effects, and tricks.