On a lot of forums, I see people say that things like CATs and Israeli bandages should be must-haves in ones range bag. From watching a lot of youtube videos, they seem straightforward to apply to somebody or ones self.
My main question is if any formal medical/trauma training is required to safely use these tools? Can one be a liability or cause more harm by improperly applying them? Or are they more or less designed to be idiot proof?