I was going through Dale Carnegie’s book notes and came across this advice from Willis Carrier for dealing with worry:
Step I. Analyze the situation fearlessly and honestly and figure out what is the worst that could possibly happen as a result of this failure.
Step II. After figuring out what is the worst that could possibly happen, reconcile yourself to accepting it, if necessary.
Step III. From that time on, calmly devote your time and energy to trying to improve upon the worst which you have already accepted mentally.
If you haven’t read Dale Carnegie’s two classics “How to Win Friends & Influence People” and “How to Stop Worrying and Start Living”, I highly recommend them. Great stuff.