Pinch your nostrils, and blow through your nose gently. The blocked air will build pressure in your ear and you will trigger the mechanism.
Do it slowly, but at one point, you'll need to force a little to trigger it.
Then the ear will go back to it's original state.
Do it several times. At one point you won't be able to do it anymore. The ear will stay like that for some time. Rest a bit.
Then practice again.
Once you got it, force yourself to yawn, and try to reproduce the effect while yawning.
The once you can do that, try to do it without yawning.
In the end, it's not a useless skill. It's very useful when you take the plane a lot, go skying in hight altitude or dive in deep water. It let you release the pressure from your ears at will.
We should teach it to all children. You often see them crying in planes because their ears hurting while the pressure changes. If you encounter that, ask them to do the first exercise (blow with the nostrils blocked). If they can't (sometime it's too late, the pressure is too high and that would hurt), make them chew something.
Do it slowly, but at one point, you'll need to force a little to trigger it.
Then the ear will go back to it's original state.
Do it several times. At one point you won't be able to do it anymore. The ear will stay like that for some time. Rest a bit.
Then practice again.
Once you got it, force yourself to yawn, and try to reproduce the effect while yawning.
The once you can do that, try to do it without yawning.
In the end, it's not a useless skill. It's very useful when you take the plane a lot, go skying in hight altitude or dive in deep water. It let you release the pressure from your ears at will.
We should teach it to all children. You often see them crying in planes because their ears hurting while the pressure changes. If you encounter that, ask them to do the first exercise (blow with the nostrils blocked). If they can't (sometime it's too late, the pressure is too high and that would hurt), make them chew something.