I don't claim to be an expert on the Nebo, by any means. My little brother drew the muzzy tag last year and I had a chance to learn the unit a little bit better. As others have said, it's a tough unit. It will test you mentally and physically.
In our experience last year, seems the elk were pretty spread out. I think the rifle hunters may had played a role in that. Elk seemed to be down in the deep nasty places. Doesn't seem like they really "herd" up like in other units. You see smaller groups here and there.
Early season scouting, we had seen good numbers of elk and bulls. By the time the hunt rolled around it was a whole different story.
All that being said, my brother did kill a bull. We decided if we had a chance at a decent bull we were going to take it. It was the only bull we saw on our hunt, we did only hunt the first morning though.
I will be willing to share any other info you might need. Just let me know if you draw.
Good luck!