I have a photo of a fat kid and need someone to make him look skinny. I will need a step by step tutorial on how you do it. Please send me a PM with quote
Definitely not an easy task, but still - everything possible in Photoshopland Take a look at this link - The Lazy Photographers Way to Look Slim and I recommend you pay attention to the video tutorial on the Liquify filter in Photoshop. It is a very powerful tool in your case. Good luck!