First Aid training will not make you infallible and you need to be aware of this, some situations cannot be saved, unfortunately been there, done that, but at least with a bit of knowledge you can try. I have been a First Aider at Work for 20 years and completed some military training prior so have some idea but always willing to attend more, no vote from me as you didn't list anywhere local. Any intention in Yorkshire?
Any course is worth doing as you will learn something, as they say, but this has to be top of the list in terms of "whats in it for me?" Just think your next casualty could be family and friends........ your choice, do the course and have a chance or panic in headless chicken mode and possibly add further issues to a deteriorating situation?