I've hunted pronghorns most years for almost 45 years, in Colorado, Wyoming, and Montana. All of these hunts were DIY, and most were on public land or private land open to hunting with permission either by knocking in doors or Montana's Block Management System.
In recent years, access to private lands has become increasingly difficult, so be careful about applying in units with very little public land.
Pronghorn country is usually very open sagebrush (although they do love alfalfa) and they are usually easy to spot. If you're hunting in unfamiliar country, it would help to get there a couple of days early and scout.