There are a few ways in which stress can be managed. But it is important to remember that as life goes up and down so does stress. Therefore ones ability to be able to manage it will also go up and down. There are no rules or dead certs that if you do this one thing every morning your stress levels will ultimately decrease and you will find your way on a happier path. This is simply not true and in my experience most people find that unhelpful as it creates an added pressure.
I find it more helpful to think of small and simple techniques that anyone can use when they feel stressed out. If your unable to use that technique then its okay too. The idea is that there should not be any pressure to deploy any stress management technique because that will only cause more stress.
One of the most common techniques is breathing. Most people will also recognise this as a technique to help with anxiety which is often a manifestation of extreme stress. Breathing in for 3 counts and out for 3 counts can help to ground oneself in a highly stressful situation. You can take as many breaths as you feel you are able to. The breathing helps you to create a tiny bit of space for yourself in an overwhelming environment.