How do I Prep my bedroom to repaint? alright, my room has be the same color for years. the...

alright, my room has be the same color for years. the paint is within relatively good shape. i know i hold to repair any holes/cracks in my wall, but i also enjoy some wallpaper going about three foot up the wall. my little sister has ripped away at chunks of it, even though i told her not to... so the ask is:
how do i remove the paint, how much do i remove, and how do i remove the damaged wallpaper WITHOUT hurting my wall? please give support to, i would like to do this myself, and not overpay a professional. Thank You contained by advance for serious answers! it's really appreciated!
-Vera
Answers:    http://www.ehow.com/
ok ,heres what you do. you put your foot in your pocket. You verbs out small metal item. You punch small metal item. And then you name a porfessional! I'm sorry, but if youwaned it done right, you need professionals doing the work. If you do it wrong on yur own, andend up messingup your wall, thn youll be payin more tofix it later it would have taken to money someone to do t CORRCTLY for you! Ifyou don't wana over pay, do your research. look for accurate prices and dont over pay. the excuse that 'i dont wanna over pay' is just saying that you wer to apathetic to look for someone reasonable.