Here we go, the forum regulars crucifying a new person who comes to post here. Don't let a lot of these people get you down. It is a cult.
To the OP:
Stay clam, remember you aren't the one dying. You are an EMT, and realistically there isn't much you are going to do to hurt this person. Board/Collar 'em up and get 'em on the way to the ER. Your assessment can be done in route. You'll be fine kid, just take a deep breather and stay level headed. It will fall into place soon enough.