Do some tutorials, learn some techniques, then decide how lacking your artistic talent is. A lot of us don't have tablets and others cope with a variety of limitations. Gandwarf is a master of town mapping and uses CC3 to do it. I'm not a master of anything, but I do okay and I'm colorblind. Coyotemax does superb work, and he had all of his limbs ripped off in a tragic catnip accident.
The moral of the story is that you don't need expensive software or hardware to make good maps. That and don't mess with catnip unless you know what you're doing.