I'm sure that veteran CPAP/APAP users are aware of this, but I hope it helps anyone just getting started.
Don't give up!
Everybody is different. That means that you have to be willing and able to try different masks, tubing, and machines. You might have to try many different masks before you find something that works for you. Then, over time, something about you will change and it won't work right anymore. For example, in the beginning, a simple nasal mask was fine for me, but the forehead cushion gave me a headache. So I modified the mask to redistribute the pressure on that point of contact. Ultimately I bought a different mask.
As I lost teeth, my tongue, teeth, and cheeks could no longer form a seal, and that caused the air pressure to blow out of my mouth. That caused "dry mouth" which caused more tooth decay and more loss of teeth. For a while I would stuff a wad of tissues between my back teeth and cheeks to stop the leak. Eventually, my mouth would no longer stay closed while sleeping, so I changed to using full-face masks.
Tip on condensation:
If you use a humidifier in your PAP circuit (and you should), and you sleep in a cold bedroom, water will condense and pool in your tubing and mask. This is known as
"rain-out". Quite annoying!
Demand that your machine comes with a HEATED TUBE. Those insulated covers that they sell (or that you could make) do not work.
There have been numerous problems that have come along. Sometimes you have to come up with your own solution. Your equipment provider can help, but you will have to be aware of all the equipment you can choose from. Here is a link to a site that I like:
www.cpap.com
They will let you return a mask that doesn't work for you and send you another one to try. I am on their email list to keep aware of new equipment and accessories.
In spite of our many problems, we must NEVER lose faith that Jesus is fully aware of our suffering. Satan will tempt us to blame Him. Don't give in to that temptation!
May God bless you all!