From my experience I will also toys out there that if you are the only one there in an emergency, even if you aren't sure you have the skills, DON'T WAIT for someone more qualified. By all means when someone more qualified get there or is there let them take over but don't wait. About 10 years ago I went to pick a friend up from the hospital. He was being released and supposed to be all good. We went to the parking lot (nurse didn't go with us) and as he tried to get in the trick he went unresponsive. Long story short he had several medical issues and my training was limited, we were about 100 yards from ER door, 2 people had informed people inside and had called 911 so I was SURE well qualified help would be there in moments and was afraid I might do more damage by trying to help. Thought my perception of time was warped by adrenalin but no, it took first responders about 45 minutes to get there, right under the life flight pad of the ER and friend died. He may not have been saved anyway but point is (and instructor in first responder training gave same sentiment) you can't really go to wrong with a dead or near dead patient, do nothing they WILL die, do something even if it's wrong and they just may live, worst case is same result as doing nothing. The one difference is still being haunted over a decade later wondering if he could have lived of I had acted rather than waiting for someone qualified.