The Res is IMO hunted pretty hard from my experiences, but we have always got our deer.
Don't expect to see big 6 pointers, but I do see a few 5 pointers and 4 pointers & usually they are running off from another hunter spooking them. Don't expect a 80 deer day and you should be good to go. Hunt early AM or early/late eve. More Does than bucks. Those whitetails don't mess around if they are spooked, gone over the hill they will be.
If you can get away from the road and atv guys it is fairly decent, deer/elk are very skittish come October.
Google Plummer ID or where you friend is and you can see the area better than I can describe.
Lots of wide open farm agri-lands & then tons of groups of trees where they will be in.
If your friend lives on the Res you may have better luck around the ranch trees, gullys etc.
I have seen opening weekends with almost every hi way pull out full of vehicles.