Redo redo redo. Sound familiar? That is so routine when writing a book. But when your done, your glad you did redo.
I had the prevelaige of being in a movie shooting last night as an extra. I was even more lucky to be sitting at the dinner table with the main charater. Yes we had to re-shoot the scene several time including different angles of the camera.
Everything has to be done more then once (99.99% of the time) to make sure its perfect. Tired? Yes. Redoing can be frustrating? Yes. Is it worth it? Yes.
Try not to get discourage of having to rewrite your work. The more you do it, the better it will get.
I'm preaching mostly to myself to get motivated to write that book in the NaNoWriMo group for this month.