This article is from the Alternative Medicine Therapies guide.
Although aromatherapy is simple and safe enough to be done at home, seeing a trained practitioner may help you choose the right essential oils for the effects you want.
There is no licensing of aromatherapists in the United States, although Great Britain and other European countries do require it. In the U.S. it is possible for aromatherapy practitioners to receive "certification" for simply having completed course work in a few weekend seminars or by mail. Therefore certification should not necessarily be considered a reflection of clinical experience or competence.
To be sure you are seeing a qualified aromatherapist, consider working with (or getting a referral from) a massage therapist, chiropractor, or other practitioner who has had some clinical training.