If you're interested in being useful in the case of an accident I would suggest taking a first aid course and obtaining your CPR certification. Know your limits and always put your own safety first!
I also feel compelled to say that there's a lot of stuff in the article that an untrained person should not be doing. There also are a few things that don't need to be done (document 5min HR and RR, seriously?).
Still, it's good as an informational read. In the end I hope you realize that even the best trained person can only do so much without the proper tools.
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