Some random thoughts:
- If hunting during the day, remember coyotes will probably see you before you see them, especially if you don't take care to not make a ton of noise and do dumb things like skyline yourself against the top of that hill you just walked over to get to where you are going to set up.
- Wind, wind and wind. Learn where it comes from, where to set up and where not to be.
- Don't give up. Biggest mistake people make is they don't see one after 10-15 minutes and they get up and move. Not only is that nowhere near how long it COULD take, you are now also screwing up the current territory you are in and now need to possibly move pretty far for the next stand.
- It can take 45 minutes to call that coyote up to you.
- You may not see a coyote, but that doesn't mean hes not there. At night with nightvision and IR, I've seen exactly how crafty they are going from cover to cover, taking side trails down washes you can't see and then just deciding to sit in a bush for 5 minutes.
- Remember that coyotes have territories (there are obviously exemptions to this; ie, mating season). It's been estimated they are roughly 1.5 miles square on average but obviously not a perfect grid square. If you're not having any luck, don't just move 400 yards down the road and hope for better luck; you're going to have to relocate quite a bit to possibly get into a new territory.
- Know the time of year and what's going on. This will also influence which calls you use.
- Don't use the same calls all the time. Educated coyotes may be leery of them or have heard them 5000 times already. I've managed to call some in with the most random animal noises on my FoxPro when I was bored and wasn't having luck with the usual things.
- If shooting with a scoped rifle, make sure you set up with as many fields of fire as you can; don't pigeonhole yourself to only seeing one approach when there are a ton more just over the other side of where you are set up.
- When calling, start soft. Don't trumpet it out. Gradually increase volume and then call for 30-45 seconds, wait 3-4 minutes, call 30-45 seconds.