The thing is that it’s not easy to put it into practice. I had a panic attack two weeks after my dad passed away and I swear you that I couldn’t apply any mindfulness or relaxation technique or any other thing. I had a valium shot and that’s it.
So, I would tell you take it easy, practice mindfulness but don’t have high expectations because it’s not a magic trick and it takes time to get something of it. Take it as a process, a path noone knows how much you are gonna be able to achieve.
Practice it daily, formally and informally ( dedicating several daily tasks to practice it).
Take it as an exercise where the outcomes don’t matter but what you can learn about yourself.
Even when this technique didn’t help me that time when the panic attack, it was very helpful in other occasions and I was only a beginner.