Most people think the saying ‘first impressions count’ is all about clothes or hair. They’re wrong (to a degree). It’s more about attitude than anything else.
How you carry yourself when you enter the room; how you interact in the opening few seconds; your handshake; your eye contact; your confidence.
It’s the X Factor test. Contestants stroll out on stage and before they sing a note the judges have formed an opinion. I’m guessing that original sniff test of an opinion is correct in the vast majority of cases (Susan Boyle is the notable exception).
I had the horrific experience of calling an ambulance for a heart attack victim recently. Of course, just having the medics arrive released some of the pressure in the room (help had come!) but their attitude was exemplary. They were: calm, authoritative, professional, clear communicators, even humorous with an obvious chain of command.
It’s largely natural, but like most things, we can teach ourselves to improve our attitude. These medics clearly had.