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This video demonstrates a good breathing strategy for the mask, starting at about 8:00. After showing it with the mask, he also demonstrates with just the mouthpiece. I would only observe, particularly regarding the mouthpiece, that it's okay to remove the mouthpiece when you breathe out, as long as you don't breathe in any room air. Same is true for the mask, in my opinion. Here's another one, using just the mouthpiece. The breathing instruction begins at about 5:30. A well-known CH doctor recommends looking toward your feet as you use the O2. Some people find that that seems to help. Like spiny says, stay on the O2 for another 5 minutes or so after you've aborted the attack.