Haven't been. I've heard though you should be ready to walk a ways and have equipment that is easily mobile.
This is correct, while I have never hunted Hagerman I do know lots of people who have and some are more successful than others and yes you better have your act together when it comes to being able to walk and having gear you can move.
I graduated high school from Sherman and lived most of my life there and the best advice I can give you when it comes to bow hunting that part of the world is....
GOOGLE EARTH IS YOUR FRIEND!
You can do ALOT of scouting from your computer by seeing it from aerial view before you ever put boots on the ground for scouting.