It seems like I have been pretty lucky so far. In my sleep study I had an API of 73 (not a typo), stopped breathing at one point for 2:16, and had almost no REM sleep.
My initial pressure setting is 7. When the person fitting me for masks said to try pillows since they were most comfortable I said I was a mouth breather and so not much point. She said that usually stops with CPAP. She was right, the pillows work fine for me, my API dropped down to about 3, and I had a dream.
I sleep well with the pillows but my nose is a bit sore from the pressing, how long does it take for the nose to toughen up? Weeks, months?
I don't think the mask is over tight, but if my nose does not get comfortable in a bit, I'll consider loosening straps and watch leakage.
I figure I should try a mask that goes over the mouth and have it as a backup for times when my nose is clogged. Is that a common approach?