Can I use hypnosis to improve myself?

Hypnosis works but you have to be really good at it or find a well known professional. My advice don't try to hpynotise yourself its very dangerous. If you want to remain calm than you have to simply have the courage to not be afraid to do mistakes or failure. Remaining calm is easy you just have to keep affirming yourself for the betterment of yourself. I know the fear its quite something but don't fear it just keep trying to remain calm eventually you will be calm. And it would sooner than you think :)