Autogenic training or any other relaxation technique should be used 2-4 times per day to have the desired result. Luckily it feels great to practice AT since it makes you feel calm, assertive, free of negative emotions, and often puts you in a good mood.

Every day get 8 hours of sleep, drink enough water, eat a balanced diet, have a "do nothing" activity (sitcom, book) for one hour, go for a long walk in a park, and practice a relaxation technique (de-stresses best). 

AT is practiced in a quiet not too bright environment with eyes closed sitting on a comfortable chair or lying comfortably. By repeating body formulas along with passive concentration you achieve deep relaxation in just 10 minutes. It takes several weeks to learn AT properly, but the depth of relaxation it induces is worth the time.

Autogenic training, transcendental meditation, and some other relaxation techniques have been shown to help with many conditions such as general well-being, anxiety, insomnia, tension headaches, mild depression, and others. If these conditions are not severe and stress is their primary drive, the effect of relaxation is even more profound.