I've called in more than 100 coyotes with the HotDog. It works great but be sure to use the howls in moderation. This time of year, I only use it on the first stand at dawn and sometimes last stand at dusk. Even at that, I only make three howls and then stop. Not three sequences, just three howls.
Stick to prey distress and try some coyote pup distress if the rabbit sounds aren't working. Woodpeckers and other bird sounds are great when too many hunters are playing the jack or cottontail. If you have the ability to do so, add some crow sounds or magpies in with the distress cries to add some realism and get the coyotes comfortable.
DON'T CALL TOO LOUD for the first five minutes. Turn on the electronic just loud enough to hear it.
Make sure you have a clear shooting lane down wind. If you cant see the down-wind approach, move so that you can before you start calling.
Sit in the shade and rotate your head from hard left to hard right. Not just straight out in front of you. You'll hear people say, only use your eyes to look and don't move your head. Disregard this for now. You don't have enough experience to even know if you're setting up right so don't limit your vision to where you think they'll respond because you'll probably be wrong most of the time until you get the hang of it. Turn your head slowly. Until you get several kills under your belt, your head should be on a swivel looking everywhere, including behind you. Most new callers never see the coyotes they call in because they simply aren't looking for something small enough. I'll bet 20-30 times a season I've heard clients say "I thought it was just a rabbit" when a coyotes is on its way in. Look smaller!
Always, always, always glass for 2-5 minutes looking at every detail before breaking stand. I look for coyote ears and you'd be surprized at how many I find when I thought it was a dry stand. I never say to myself, there's nothing out there, in fact, I do the opposite and say I know there's one out there I just have to find it. Play "Where's Waldo?" I call it "Where's Wile E?" I'm an idiot I know, but it works.
Good Luck.