Nicolas Cole argues that service providers must practice what they sell. He's written ten books and gets quarter-million-dollar ghostwriting offers because his own work proves he can deliver. Your personal track record is your best case study.
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I feel very strongly that you should not provide a service for something that you are not actively doing for yourself. If you're going to provide newsletter ghostwriting, you should have your own newsletter. If you're going to provide social ghostwriting for other people, you should write and create your own social content. If you're going to ghostwrite YouTube scripts for YouTubers, you should have your own YouTube channel. If you're going to ghostwrite books for other people, you should be writing your own books. The single greatest case study that you will ever have is yourself. You should be pointing to the things that you are doing yourself. When someone reaches out to to me and says, "Cole, I will pay you a quarter million dollars to ghostwrite my book," they aren't saying that because they know I've ghostwritten books for all of these people. They're saying that because I've written 10 books. I am my own case study, and you should be your own case study.