Personally I'd recommend just getting an inexpensive 3D Leafy Suit. Really only need the jacket if wearing pants of similar color palette. (North Mountain Gear makes several nice inexpensive ones. I currently use FirstLite's one, because it passes thru even more air, for those hot months. And it squishes dawn even smaller in the pack) 3D Leafy boonie hat (my favorite headwear while hunting, nice and light, doesn't make you too sweaty), mesh facemask and liner gloves which also have similar colors in their camo pattern to hide you. I've seen a buncha cool stuff up close and personal while wearing the leafy gear. I once literally had a Cottontail come from behind the scrub oak I was sitting by.... to around 18" from my Right Boot! Was soo damn cute to see up close! Almost felt bad for taking him home with me.
If you wear eyewear like I have to, my belief is it would be preferable to make sure it's comprised of muted dull colors, and I wouldn't have lenses with tint or auto-darkening, as that'd be easier for them to discern as a pair of eyeballs, is my thinking. Also it seems a little easier for a non wrap-around eyewear style to have less chance of them seeing reflection of the lense. (BTW be mindful when checking your watch not to inadvertently cause a reflection from it to light up your face!)
So... are you going to be calling them in with a eCaller? Stuff it into a bush like a scrub oak or Juniper at about chest height, to get it off the ground so the sound carries farther.
If you go someplace where you've seen rabbits in that place... and especially if like you've already seen a coyote or bobcat in such a place... that's a good place to try. Or like if it has a water source and evidence of small game around there.
In general you want to get low to the ground on your sit, and pick a place to sit at where you're looking upon the caller from a crosswind perspective, backed up into a scrub oak, or juniper or leaned against a big ol pine. And you being in the shadow. And if you can arrange it to where when they're coming in.. they'll be blinded by the sunlight.... even better! And if possible in front of you like a small piece of what I call "rabbit brush", one of those various knee-high types of plains habitat low-lying bushes. YOu just don't want it so tall that you can't get the shot off though.
Start the eCaller at a volume level that's more like what you'd think the natural volume of that prey would be... just in case there is one close by that doesn't know you're there yet. And before you even press play.... make sure you're entirely ready... because sometimes they'll shock you and come in very quickly. While other times it's just you making sets and just putting in the work and grinding it out all day so you can check some location off your list as a Nope.
As you begin allowing the eCaller to play... after like the first 2 minutes. Give it like at least a 30sec-60sec pause... and when you resume playing again have the volume bumped up a couple notches higher. And.. if you're going to switch to a different sound, I tend to give the pause just a little more time, so they can forget about what sound it was that just played prior.
Dawn likely to be slightly better most times. And... As the sun is starting to create good shadows again in the opposite direction is a good time as well. Basically the times you'd typically see the Rabbits starting to come back out again.
If you're not having any success... another good thing to try is picking some bird distress sounds sometimes. Like if you can identify the kinds of birds you're naturally seeing flying around that area... if you have one of their sounds on the caller, definitely make use of that. As it'd be a sound they're familiar with. So that adds realism to what they perceive.
Regarding how often is it successful? Welp.. depends on if you've found a good spot. But you need to be prepared for your outings resulting in a big fat zero. But if the kind of terrain looks right.. and there's sighting of the various prey animals they'd target... then it's more likely that you've blown it for yourself on the way in to the spot.
Things like :
Not quietly and gently closing your vehicle doors.
Parking the vehicle so it's out of sight of where you're going to head into at.
Not putting thought into the path you'll take in order to hike-in to the spot you wanna try in such a way so that you're not wafting your own scent all across towards the area downwind they are likely to come in from. Or maybe you're just too fidgety.
And you REALLY do need to remain quite. If you mess up and like sniff or something... they're hearing is insanely good and they're head will whip around and point damn near directly at you. But.... if you remain still and quiet. and that caller is continuing to wail.. they'll fairly quickly revert their attention back to the caller.
And don't be surprised if, for example, you're using Jackrabbit Baby Distress.. and you end up calling in a JackRabbit due to maternal/paternal instincts!
Your ability to remain still and not move will be the thing that helps you most, especially with bobcats. Look with your eyes first. Then... if you have to turn your head more towards a particular direction you're keen to observe... as long as you can do so uber slowly... there's a good chance they won't see it.
With a rifle... make sure your optic is dropped back down to it's lowest magnification setting BEFORE you press play! If you've got an AR that you're having to constantly put back into it's case each time you then have to drive a little further along to another spot... make sure each time you put it back away.. that you've for sure ejected the round in the chamber! Failure to remember to do that will cause you to inadvertantly put the mag back in and then proceed to pull back on the charging handle causing a 2d round to be taken off the top of the magazine so now you'll have 2 rounds "traffic jammed" into the chamber, so your trigger will be locked up solid!
You can try a motion decoy. But personally, I've stopped bringing mine because I've had some of them panic and split once they arrived onto the scene and saw the motion decoy. Also it may cause them to hang up trying to be crafty standing beside a juniper or something for cover and they'll proceed to observe that motion decoy from a distance, sizing it up, figuring out WTH it is. So that may or may not help your cause.
-G