is cashiering hard to do ?!😰

so i got a job and i'm going to be working on the cashier .. they are going to train me ... Omg i'm nervous i don't know how to work it or how it goes.... I know how to scan obvisouly but the typing the numbers in and working the money?? idk 😫how did you guys learn?????? anyone ??? Im literally clue lesss.. 

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