Of course, don’t lay down. Really learn and train to become useful in those situations. You don’t need to be professional, just properly trained. There are multiple ways to do it but you need more than a couple of days a year to also keep that training up to date.
I just have a lot of experience with people making things worse because they think the basic to medium first aid courses will make you able to help properly. And then make things worse. So my comment might have come out too harshly. But advanced first aid with the psychology of emergencies and scene management with the right attitude (mostly listening to those more experienced) will actually be useful.