How not to be nervous?

Soooo I dont have a huge problem with this but one of my friends does. So basically they’ll be straight chillin until their crush comes along, then, all of a sudden, boom, sweaty face, stuttering, can’t even speak. I’m just like 😮 it’s just a person, geezzzz. My advice to them is to just think if them as a regular person, they probably don’t even have a single romantic thought about you. BUTTT that doesn’t seem to be sufficient enough advice soooo I need some great advice to give about how not to be nervous around THAT person. Please and thank you😊