the way i learned gutturals was by talking low trying to burp and trying to take a shit at the same time. Slowly i added power to them and then after i could hold it for 5 seconds or more i started refining different techniques... I found learning gutturals to be an absolutely frustrating and slow process and at first i wouldnt be able to do it for weeks at a time. I also suggest learning to do it clean before adding things like chocolate or honey or whatever people use other than water.