Just note that if you're used to working in Photoshop for textures, you will initially find Bodypaint very clumsy to use. It doesn't exactly have a whole lot of options for 2D image editing like Photoshop does. But the nice part is that it supports .PSD files quite well so you will often be moving your textures back and forth between the 2 apps.

In fact if i'm in a hurry, i will do most of initial layout and copypasta inside Photoshop itself. Then you import this into bodypaint and fix any seams or other fine work you need to do.