You can get audio or video tapes that give breathing instruction and teach relaxation techniques at health food stores, bookstores, and by mail order. It's probably fine to learn breathing and relaxation from a tape or booklet, but don't try the yoga exercises without a skilled teacher. He or she can make corrections, caution you when necessary, and help you to adapt poses if needed.
It will be worth it to you to spend a little time finding an instructor who is right for you. Your doctor or other health care professional may be able to recommend a yoga instructor. Get referrals for a yoga instructor as you would for any professional you might wish to consult.
Yoga instructors aren't required to be certified but many of them get certified through many different programs. Ask prospective teachers if they are certified. A certified teacher isn't necessarily better than someone who isn't certified, but it's something to consider.
