Confidence is knowing you can handle the answer even before knowing what the answer is.

Much of anxiety about an unknown result is really doubt about your own capacity to cope with a bad one. If you trust that you can handle whatever comes, the waiting loses most of its edge, because the worst case has already been faced in some form. The question stops being whether it goes well and becomes whether you can meet it either way.

While waiting for something uncertain, spend a few minutes on what you would actually do if the answer were the one you fear. Not dwelling, just planning. Knowing you have a first move makes the uncertainty considerably lighter.