> HELP with painting my interior room?

HELP with painting my interior room?

Posted at: 2014-09-26 
I think white is no problem.

problematic problem look with google just that can assist

So a couple years ago, my dad painted my room pink (walls) and green (crown molding) and the green paint is shiny so I'm wondering if I should lightly sand the crown molding to have the new white paint to stick to. Also, I'm planning to remove the popcorn ceiling. Should I remove it first, then paint the ceiling and then paint the walls or...?