'Wilderness' can be relative. Are you looking to hunt in a designated wilderness, or just public land back country? There are lots of places in Wyoming that aren't officially wilderness areas, but are plenty wild. As Ferret says, if you are looking to hunt a designated wilderness in Wyoming, you would have to hire a guide. If, for instance, you were lucky enough to draw Wyoming area 87 (not likely, by the way), you would hunt some tremendous wild country and probably not see another hunter during September, but it is not designated wilderness. Something to consider.