If you don't want to work with these advanced programs, and if you can't get anyone to help you with the graphics either,
maybe you should consider trying a different approach.
There are like a million different ways to make graphics for your game, from clay and natural materials to pencil drawings to taking pictures of real places,
to making it all in photoshop, to hacking into and old Nintendo 8-bit system and creating your graphics from there....
The possibilities are endless...
Why do all (adventure) games have to be either prerendered 3D graphics or some cartoonish network thing?
I mean there are so many more...
Oil paintings, manga/anime, abstract art, aschii, graffitti, surrealism, realism, t' cetera.
So what I'm saying is that, if you can't do this, then do that.
Don't underestimate the power of Photoshop!
But only after you have run out of other options.
Your vision is, after all, your vision. N' stuff.
Rock da cashbah! Woo-hoo!