1. Your number one job is not to provide excellent medical care, it is not to find out what is wrong with the patient or make the correct diagnosis, it is not to follow your protocols to a T and know them all by heart, it is not to have the "fastest, best, most awesome" approach to a certain disease process or call type, it is not to turn calls over rapidly or document the best. Your number one job is not to save lives, or reduce pain, or to take the patient to the hospital...I repeat...your number one job is NOT to take the patient to the hospital.
Your number one job is to be a patient advocate. Period.
This was probably taught out of chapter one or two of your EMT book in school and passed by rapidly for all the "more important" life saving knowledge you will need to do this job. You will find many more patients that need someone to talk to, a phone number to a rehab facility for a family member, a blanket, a sandwich, a discussion about diabetes management or a talk about how to properly ice an ankle, elevate, and follow up with their primary care doctor as needed. The difference you will make in this job will not be on an "emergency" call. Treat people as people, this job is about humanity (or you will get sucked into the lack of it...).
Run a call, do your best to find out what the underlying problem is, did the person not make it into the homeless shelter, do they not get their prescriptions filled, are they hungry, do they not have primary care, do they need some education on how to use their home nebulizer....figure it out and do everything you can to help them for the long term. You will not be able to solve most problems, or very many at all, but the problems we can solve are usually the easiest at all...and have nothing to do with medical care as it was taught to you. It is not hard for us to offer some helpful information to people that haven't had anyone take 10 seconds to help them solve the underlying problem.
Do everything you can to not lose your humanity in this job
Four other suggestions would fall so far below this that I won't even bother including them.