Precisely The key to any art work is being able to use the tool(s) provided. I don't consider myself an aircraft repainter per ce but i am an artist. I manage to repaint my FS9 planes to my own satisfaction using Pixia 3.1 (which is FREE)
Sample
Here's Pixia with 24bit PAI paint-kit loaded
From here on it's simly a matter of using Layers to add the requisite features; i.e., paint, text, logos, etc., and saving it as BMP and convert to DXT3 using DXTbmp.exe
There ya go . . . a complete repainting tutorial (using any paint program of your choice).
Bill