I've received a lot - literally hundreds - of letters from people requesting more information on how to use healing stones. The best advice I can give you is to use your instincts.
Personally, I've always used them by simply putting them in a pocket, rubbing on them periodically throughout my day or forgetting about them altogether. Simply having the stone in your presense will make an impact on your energy field. You actually don't have to do a thing.
I also use stones during the day if I feel a need to close my eyes for a few minutes and take a brief rest. I don't do this as much as I used to because I've been too busy. If powernapping is conveneient for you, lay the stone on your stomach or forehead (whichever you are guided) and simply go to sleep. If you are at all sensitive to energy you will feel a rise of energy and then it will taper off after a bit. I think this is the body experiencing the frequency wave of the stone. On average, to ride this wave takes about 20 minutes. See for yourself! It can be different for different people.
Lately I've used the stones mostly at night as I am drifting off to sleep. I lay the stones on my stomach and ribcage and again, drift off to sleep. Sometimes I have a sensation of the stone completely relaxing me and then I drift off to sleep. At times, once it is finished working, it will literally fall off or I might wake up and move it and other times it will gravitate and stick to my skin, even after falling or moving.
As I said, there is very little for you to "do" other than simply allow.
This information is covered in greater detail in my books and will also be included in the new forthcoming book
Top Ten Healing Stones of All Time.
Above all, use your instincts. There is no right or wrong in this. Just try it! Have fun and be well!
If you want to learn more about stones in detail, you can also subscribe to my new Rock of the Month Club where you will recieve a new stone every month and a detailed newsletter telling you all about your new stone, how to use it, etc.