how do i quit

i just got a job somewhere and did one day of training but my first official day is this weekend. i’ve been stressing because i really just don’t necessarily like it there and i don’t know how or when to tell them i don’t think it’s the right fit for me. should i do it at the end of my first day if i still don’t like it? i don’t want them to get mad at me but i also don’t want to wait too long and then end up screwing them bc at that point i’d be fully trained and they’d be more dependent on me.

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