Tried and coughed and gagged for a couple days and said screw it.
Bought a slate and got a 21# tom that yr.
Next yr tried the HS DD diaphragm calls again.
Gag and cough, and then a yelp.
YGBKM.
Within 2 days I could yelp, purr and cut. I have a high roof mouth and my first call I trimmed too much.
I don't trim any now.
Like double reeds and nothing with a nasty tail to buzz my tongue.
Its kinda like taking a Ruger MK .22 pistol apart.
Frustrating if not aware of whats what, but once you do it right you go "is that all there is to it?".
I still hunt w a slate, but slobber all over a dual reed as well.
Its easy, kinda weird to explain. The old DVD "so you want to be a turkey hunter" explains it but it (for me) didn't translate to what was going on in my mouth.
Now I just chuck a call in and practice a day or two before season and am good to go.
Like riding a bike.
Just relax and mess with it off and on and it'll click.