Would not consider myself an expert, but I have called in a few elk over the years...
I first put one of those calls in my mouth at Glen Berry's booth at the sportsmans show in the Kingdome back in 1986, or '87.
Started out just trying to make a sound.
And then worked on imitating the sounds on my Larry Jones cassette tapes.
Then, (yes, I was "THAT GUY") I went out in the woods and practiced on real elk.
By the time season came around, I was extremely confident.
Had a great season, called in several bulls, even managed to harvest a 5pt and was hooked.
I don't practice as much now, especially not in the woods before season.
But one similarity between my early days, and next year, is that I will start out practicing my cow/calf sounds, then gradually warm up to full blown bugles.
I think about the sounds as I make them, and visualize what the animal looks like, and think about emotion.
I believe you can be the worst sounding caller out there, but if you get the emotion or "cadence" correct, it is more effective than the purest sounding bugles.
Even a shy bull will come to a lone cow, or cow/calf.
Pre-rut, rut, even post rut.
Bugles are great tools for locating and calling, but the most common thing I hear every year from other hunters is "they (elk) are not talking" and quite often I have been talking to them (elk) just fine.
Difference is that the other hunters are walking miles behind gates on logging roads and bugling into bottoms not getting a response, and pushing on until they find a hot bull.
I am walking creek bottoms and communicating to an imaginary herd, and often the herd becomes real.
Both the elk and I hear, sometimes even see these hunters as they go on past, often the elk even answers, but the hunters do not hear them.
Every elk communicates, and most elk are cows, so I make mostly cow sounds.
The difference is that elk have huge ears that can hear a mouse fart at 100 yards, they really only get loud on occasion, and with a purpose.
But if I stir up a little excited cow talk, I cannot help but bugle if the mood strikes.
Bugles are fun, but kind of like cheering at a sporting event, you want to do it at the right time, or every elk in the woods will know you are there, and ignore you.