cman: if you can, try to join a sleep apena forum. It helped me a lot. Also.... see if you can stay over for the sleep test. Try the nose attachment and also the nose and mouth. It will depend on how you breath. My dad has a CPAP too and he breathes through is nose but I breakth through my mouth. The nose one didnt work for me.
I love my CPAP. I get the best nights sleeps.
At first it is hard to get used to... the mask that is but you will get used to it. And you will love. it. Let me know if you have any questions.