Prom Help

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okay so prom is coming up. mine is on April 1st(🙄april fools)..17 days away. I am a junior and this is my first prom and i want advice on how to prep and also what time to do everything on the day of prom. 
any advice would help! 
also back acne..i've had it since i was in 7th grade and like i said i'm a junior. i just want it to be gone forever😭but i really need it gone for prom. help???