When faced with a stressful situation, your beliefs and associations come into play. Working on changing those beliefs and associations can alter and aleviate some of your stress.
And further, if you prepare for stressful situations or the situations you associate with stress - you can train your mind to a new comfort level.
Disclosure: This post may contain links to products or services with which I have an affiliate relationship and may receive compensation from your actions through such links. However, I don't let that corrupt my perspective and I don't recommend only affiliates.