It's not difficult unless you have sinus problems. it is, however not something you pick up overnight. If you smoke, that wil slow you down, also. The process requires one to use their cheek & throat muscles to steadily force air out of the mouth cavity while at the same time breathing air into the sinus cavity. One practice technique I was told of ( and this may sound silly), is to fill your mouth completely with water until your cheeks are bulging, lay on a couch or bed with your head hanging upside down and practice breathing into your sinus. Another is to fill a glass with water, and practice the technique by exhaling through a straw in the water. The idea is to get a steady stream of bubbles without breaking your rythm. while your learning, the process takes alot wind out of you....good luck.