While you may be able to find a local guide, hunting antelope isn't that difficult. what's difficult is find them on property where you have permission/access.
Antelope are prairie animals so they generally just stand in the middle of fields where you can see them. The trouble is that they can see you and if you spook them, they will go for a half mile jog like it's nothing.
In order to avoid this, when you spot them from your vehicle, drive out of sight, then stalk your way back.
Me and a buddy went to hunt antelope in WY a couple years ago and knew nothing other than what we had read on LRH. You can read all about our adventure here:
2 VA LRHers in eastern WY