You have to not listen to the nay sayers because there will be many and often they'll be much more qualified than you and cause you to sort of doubt yourself.
Your manuscript is both good and original; but the part that is good is not original, and the part that is original is not good.
I found that a bit unfair. However, I did feel quite liberated when I left. I'm very grateful to the show - it revived a flagging career, but I'm glad to be away from it now.