The best things that an outfitter up there can help you with is scouting, area knowledge, and transportation to where you need to be every morning.
I'm no western Wyoming expert, but I can tell you that trying to walk in from the bottoms of those canyons everyday, is a lot of work and takes a lot of time. The first few days is no problem, but 3-7 days in, I would be worn out.
I would recommend backpacking and camping close to where you want to hunt and go back to the truck every 3 days for food instead of trying to walk in everyday....????
I also think scouting is important, because although there are "good" bucks in most areas, there are only a few "great" bucks running around up there. So, when you hire a guide you are hopefully paying for some preseason scouting. And, of course, his/her knowledge from previous years of hunting is also quite valuable.
I have never hunted with a guide up there, but that is because I can usually allocated 6-8+ days to scouting each summer and 7-10+ days to hunting. Plus, I like to do it all myself and I couldn't afford a guide.
My best advice to you would be, go up there scouting for 3 days. Try those walks you're thinking about every morning, see what kind of bucks you can turn up, and then decide if you need a guide.
Should be a fun hunt for you either way. That country sure is awesome and rugged. There are also a few nice bucks running around and a handful of great ones.
Brian Latturner
MonsterMuleys.com