Here is some advice for 45 in Wyo:
A few years back when I knew very little of Pronghorn hunting I purchased 45 tags on a whim. Talked my buddy into it and packed up the truck, headed right up there. I have a few land owners there now that I built good relationships with, all it takes is some good talkin and strong display of character. I gained access to places that had not been hunted in 5+ years. My advice, order the GMU map for this unit off the web, stay on the north side of the unit, use the hell out of your optics, and knock on alot of doors. With how friendly the ranchers are you can't fail, just remember you might have to drive several miles to find the ranchers residence, they have scattered chunks of land. You might find the occasional rancher who wants to charge $100 trespass fee, dont do it there are PLENTY of free opportunities. Good luck and watch out for their healthy population of badgers!