Being a barista is awesome when you love coffee and everything about it. Because making a really good coffee is a true art. But just as it has its pros it also has its cons. It is basically the same with any job in the world. So please, do not take this personally, I do not want to discourage you from becoming a barista.
However, I believe that there are things you should know. And there are faces that you should prepare to make often. Even though you should not.
1. A face you make when your customer (talking on a phone) asks you to hold on.
2. When customer asks for extra, extra caramel.
3. Face you make when somebody orders Ice Water.
4. When the one who orders the most complicated drink brings it back to tell you that you have made it wrong.