[Bill]

Timm
The excercise that helps me the most is with a balloon. To blow it up you must close off your nostrils and to let the air out your nose you must open them. Insert balloon, in through the nose to the lungs, out to the balloon from the lungs, then let the air in the balloon out your nose.
Head down in the water, using you cheeks instead of the balloon and you've got it.