Do This Today

Rather than worry, act. You worry because something might go wrong. So instead of brooding over what might go wrong why not take actions to make it happen right. May be you actions will give you desired outcome and by keeping busy in action, you will have little time left to worry. And even if the outcome is not exactly the way you desired, you will have satisfaction of having tried your best.
(Worries give rise to stress. So learn to practice "Stress Management" till such time you get over habit of worrying. Refer: http://managing-stress-strain.blogspot.com/)