Sigh...
Then just start making textures to GET that experience! How do you think I made the textures for Sector Gamma? By sitting there saying "I don't have enough experience"? No! By just starting!
OK, I don't wanna talk about the first textures I made, they're of bad quality, but hey, so were my first maps! And as with mapping, also my texturing skills have increased... or so other people say.