Eat sensibly - a balanced diet will provide all the necessary energy you will need during the day. Avoid nonprescription drugs and minimize your alcohol use - you need to be mentally and physically alert to deal with stress. Be mindful of the effects of excessive caffeine and sugar on nervousness. Put out the cigarettes - they restrict blood circulation and affect the stress response. Talk to Friends.
Friends can be good medicine.
Daily doses of conversation, regular social engagements, and occasional sharing of deep feelings and thoughts can reduce stress quite nicely.