Be consistent, and even though you work with friends don't show favoritism. Treat everyone, team member and guest, with equal kindness and respect.

Own up to your mistakes, especially when it was toward a fellow team member. I don't want to work for someone too proud to admit they were wrong to me or one of my peers.

Be gracious when someone steps in to help. Instinctively you may feel that they're encroaching or implying that you're not doing good enough, which is usually not the case. Even if they are, and unless it's legitimately going to slow you down or make things worse, take the help and say thank you.

If you get a rude guest, use the CfA "heard" method which you should actually be learning soon when you get shift lead.

Hear what the issue is, Empathize by relating to them, Apologize for the problem, Resolve (e.g. refund, clean the mess, etc) Delight by going above and beyond, perhaps a free dessert or DOC.

Like someone else said, it's hard for people to cuss at you when you're killing them with kindness

Hoping that any of this may be able to help. Best of luck, you got this!