I'm a recent learner (although I've gotten to where I can do the whole kit--yelps, cuts, clucks, purrs, everything except gobbles) so I can sympathize with you.

For me, I started out trying to do the thing with saying certain words to get certain calls...it did NOT work. Sounded like the most god-awful noises you've ever heard, like a cat drowning in a burlap sack thrown in the lake.

Then I heard Matt Morrett on a video say to just start with just trying to get a consistent noise. You'll know when you've got the right noise to shape the different calls from. Just get to where you can consistently make the noise, and can keep it going for several seconds. It won't sound like a turkey yet (more like a bad harmonica), but it's the starting point.

Once you can consistently make the noise, you can start using your tongue and mouth movement, along with volume and starting/stopping the sound, to shape the noise into turkey sounds. The easiest to start with is the yelp, then move on to cutting and clucking.