Like everybody in show business you think you're going to wake up one day and it's all going to be taken away from you. I think we all share an insecurity in that way everybody in show business - the ones I talk to anyway.
You just have to trust your instincts and hope that if someone doesn't like your idea you can prove them wrong in the final process. In the end you can please some of the people some of the time but that's about all you can do.