It is great to find this forum and all the knowledgeable and helpful people! There may be hope for me yet!

I've been lurking for a bit, but here is how I got here. Last summer, I finally went to a sleep doctor and was diagnosed with moderate sleep apnea (AHI about 30 as determined from home sleep tests. Insurance doesn't pay for overnight studies.). I tried an oral appliance for several months, at various increasing setting, and it didn't help much (but it did distend my lower jaw to the point it wouldn't reset during the day). So, after resisting, I took the plunge about 3 weeks ago.
As an aside, I find the whole process with the sleep doctor disheartening. I was given a machine, the DME specialist went over the equipment quickly, have any questions? and bang ... see you in two months! (Wish I had the foresight to find this site beforehand, my bad.)
Besides getting used to the mask and device, I've mainly been trying to figure out how to sleep while minimize leaks (They wake me up.). The DME started me on a small cushion, but I think a medium works better ... if I sleep on my back. If I sleep on my side (which I prefer), I find that I adjust my head while sleeping in a way that changes the tension on the mask straps, leading to leaks which wake me up. AHI's have dropped to circa 20, so that is a good sign.
I was thinking of switching to nasal pillows and a chin strap (I snore). I gather chin straps don't work?!
I have SleepHead, and am reading the forum to understand and use it.
So much to learn! Thank you all.