Disklavier

I've tried Cakewalk Express and Music Writer 2000 standard edition, 
but both seem more difficult to use than I as a beginner would need.  

I am looking for software than will simply allow me to copy notes 
from a music book into the software then download to my disklavier.  
The one's above seem to want to tell me what the notes should be 
rather than accepting what i am trying to type in.

Maybe I'm missing something because all I know are the basics of 
reading and writing music notes, but there has to be a better 
software program out there.  Again all I want is software that will 
let me input notes as they appear in my music book without modifying 
the notes to be what it thinks is more appropriate.  Any suggestions?