Just started using oxygen to treat sleep apnea... HELP!?

Mary - Yes, I had two sleep studies. The Dr. told me they needed me to go back for a third one, with a cpap, to see how it goes... but they never gave me an appointment date or anything.

Also what I'm specifically talking about is the feeling of the oxygen tube ends in my nose. They are just super uncomfortable. I was wondering if I could trim them down a little? I've been on it for almost a week now and I'm getting used to the actual oxygen, it's just the tubes in my nose that drive me nuts!