Chopin's Berceuse

[Tash]

i'm gonna start playing this piece soon-yay i love it to bits- and am really paranoid about ruining it (i know this is a kinda bad attitude to have but i really don't want to place myself amongst the general lot of semi-pianists who manage to kill pieces) , so could people give me some tips about what to look out for when learning it, some common problems and bad habits people get into so i can attempt to steer clear of them? thanks!