Images like this one always impressed me and often wondered how difficult it might be. But now that I have started exploring Photoshop, it all seems so easy and simple. Its amazing how the entire intensive concept of developing and processsing photographic films in darkrooms and labs have been simplified into one 'little' software. This indeed gives you an immense sense of freedom and control over your images.
The plethora of learning material on the internet and specially on the modern day cult of 'youtube' makes it possible to learn it all - sitting right here at home.