Playing piano reductions/transcriptions of orchestral scores

[stiefel]

Hi everyone!

What's your advice on playing piano reductions of orchestral scores?  I'm going to accompany a choir on Mozart K47 "Veni Sancte Spiritus," but the music I have doesn't leave out a single texture or voice from the original orchestral score.  The result is a piano part that is so thickly textured that it is too difficult to play and also sounds bad.

Am I "allowed" to edit the music/leave out textures to make it more playable and pianistic?  How should I do this?

Thanks, Joe.