the specific step-by-step in any image isn't as important as understanding the image manipulation toolbox that IS Photoshop. If you dont have an understanding of adjustment layers and their masks or what tools generate certain effects, you're really not going to get anywhere. After that, it boils down to an artistic vision for the image, playing around, and 'what if I try ..... on this image'. And really, only the artist knows for 100% sure what the step-by-step is.
It might be shadows/highlights, dodge/burn, Hue/Sat adj, double raw processing, luminosity masking or a number of other techniques. Did you notice that the sky is *different*? The artist appears to have used a different sky from a different image from the looks of things.