Got my 2 antelope doe tags plus 2 deer doe tags this year. Its not easy anymore picking up tags as the demand and later draw date allows people to apply if they don't get tags for another state. 10 years ago there were plenty of leftovers available
Lots of Walk in areas check the WY website for maps of where they are, plus plenty of BLM. You have to be within 1/2 mile of irrigated land for does. Whitetails usually river bottems or near brushy areas
I second on a rangefinder , out there in the wide open, distance estimation can be tricky Also if you have 2 tags be ready for a quick second shot, as sometimes the Antelope can be confused for a few seconds giving you a second shot.
Good Luck!