I can teach you the basics! But I stopped using gimp a while ago. xD

i just downloaded gimp recently and i played around with it. XD
kinda fun and i'm already quite familiar with it. or at least i know use the main functions. ^_^
you can search on aff on "gimp tutorial". < that's how i know how to use the software. owo

You can download it here: http://www.gimp.org/downloads/
And there are many tutorials on AFF that teaches you how to use gimp!