I have hunted OTC antelope archery in CO for the past few years. In terms of pressure, the places I have hunted (both east and west of I-25) have significant pressure. Most of the places that hold antelope are not far from the road, maybe 3 miles over mostly flat ground, so you can't get away from pressure with your feet like you can hunting other big game. It is normal to see two trucks looking at one buck while someone else is stalking it. I have had more stalks busted by other hunters chasing the buck I am going after than anything else. Setting up a blind over a water hole would probably be your best shot, but I have never done it personally. Related to shot opportunities with spot and stalk be ready to crawl and get cactus in places there should never be cactus. I also run a lot, those antelope in the sun like to keep moving. Be ready for long shots from your knees with wind. I have found if you don't silhouette yourself and can use subtle terrain features to close the distance that is your best shot. Even with army crawling if the speed goat can see you don't expect to get within 100 yards. It can be a pain in your ass, literally... but it can be a blast to break out the bow 15 days before most other seasons and challenge your sanity.