Scout, scout, and scout some more. You will greatly increase your chance of success if you spend time scouting areas. It's easy to fool yourself into believing that any open area has coyotes. You can also be fooled fairly easily by hearing dogs calling. Many times I will hear coyotes in an area and assume its going to be great only to be frustrated when I hear a bunch but nothing comes in. I've found my success rate climbs pretty high if I actually see a coyote and then we up nearby and start calling. I've also found that if I see a coyote and for some reason can't get set up well, if I come back within the next week around the same time I'll see the coyote again very in the same general vicinity.