I really need help!!! getting TEETH removedd!!!?!

okay, so i just got my braces yesterday!. and the orthodontist said the reason for my braces was because my mouth was too crowed with teeth! and so they have to pull out 2 of my bottom teeth on wednesday! i want to know how they're going to do it, and if its going to hurt:[ and im not sure if its my baby teeth or not,i dont think it is!. but theres gnna be 2 spaces of gaps[ from my pulled out teeth] i want to know if they're going to grow, or is the braces gnna push them together making my mouth less crowded and straight!?

PLEASE HELPP!!!!!!!!
thank you:)

by the way,im 13 going on 14 in november!Www@Answer-Health@Com

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