i've been on one for 4 1/2 years, the first piece of advice is do your research and find a good machine with a heated humidifier. there are alot of different machines out there and they all make a difference, some alot more than others, research.
try to decide what machine you want and stick to it, your doc, the insurance co. and the person that actually gives you the machine will try to tell you that you dont need all that fancy stuff, dont believe it, the co. that supplies the machine gets one set price(the most expensive one) from insurance then try to sell you the cheap one and make a huge profit. demand what you want.
being severe apnea they may want you on oxygen, if so you get an oxygen generator and run a hose to the cpap. no smoking near oxygen, it makes a cigarette look like a roman candle lol.
the most important thing with cpap is the mask, get 1 or 2 that fit find the best of the 2. that was the hardest thing, trying to find one that fit and didnt leak. if your prone to colds you will need a full face mask, cant breath if your nose is stuffed up.
i can tell you it will be rough in the begining, getting a machine you like,a mask that doesnt leak, then the emotional part of having that thing strapped to your face but it will get better and you will feel like a new person.
i cant preach enough, this thing is saving your life, dont take no for an answer.
i dont know if they allow links on here but everything you need to know can be found on
www.cpaptalk,com alot of very good people and information. they have machine reviews,mask reviews and tons and tons of advice. check it out, your not alone.
so welcome future hosehead, if you have any questions, please contact me, i will help any way i can.