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Well, I just happen to do this for a living so let me try to explain best I can. Teaching usually takes an hour, so let me try to condense and answer some things. I am also on one, but mine is a bilevel or BiPap first of all you need to understand that CPAP is like saying "Kleenex" it's a trade name.
The best I can explain is that it kind of feels like breathing on a humid day. The air, due to the pressure, feels "heavy" to you when you first get used to it. Probably the most important aspect of the system is your mask. If you are prone to allergies, nasal congestion, colds or are just plain a mouth breather you need a full face mask, meaning it covers your mouth and nose. If your pressure level is low (below 12cm/H2O) and you are not a mouth breather you can usual handle a nasal mask. These tend to get a more complete seal.
THERE IS NO PERFECT MASK. All masks leak. I want you to remember this when you are getting fitted and used to your machine. Your tech (be it RN or RT) will do their best, but the reason we all look different is different facial structures. All masks will leak to some degree especially with a lot of movement. CPAP does not treat insomnia, you need to create good sleep hygiene, you need to be consistent with going to sleep at the same time, in a dark room, with no TV on. If you insist on noise, make it a fan or some other type of white noise.
A CPAP can work, it takes differing levels of time to get used to it. The most important thing is you have to WANT to use it. Otherwise you will make 101 excuses as to why you "can't" wear it. Very rarely is there someone who truly cant, unless they are an extreme clausterphobic and I mean in the clinical sense. Mine works for me. I am less tired, less cranky, don't nap like I used to. I also don't seem to get sick as often because I am rested. The long term effects of OSA (obstructive sleep apnea) are catastrophic including and increased risk of congestive heart, diabetes, hypertension etc...
Make sure you go to a company that has healthcare specialists, not some company that drops off the machine and says "here wear it" technical support is important when you are starting out with CPAP.