I use GIMP and whitestuff's tutorial. I had little experience with photo manipulation programs until I started making Heroscape customs - the closest thing I had was QuarkXpress back when I worked at a small newspaper. GIMP wasn't too hard to learn, thanks to whitestuff's excellent tutorial - it took me the better part of 5 hours, but I managed it, and I'm one of the more computer-illiterate people I know. (My friends refer to me as their token Luddite.) Of course, I probably couldn't use GIMP for much more than making Heroscape customs right now, but for now that's all I need it for.