So, step one. Say an affirmation to yourself, like "I, ______ (your name) am a brilliant and prolific artist." Write it ten times in a row, and something interesting will happen. Bad stuff will start coming into your mind. Like "who are you kidding, you're crap" or whatever. These are called Blurts.
You are to take your Blurts and convert them to affirmations. For example: "I, Fred, am untalented and phony" might be converted to the affirmation "I, Fred, am genuinely talented."
Here are some other examples of affirmations:
I am a channel for God's creativity, and my work comes to good.
My dreams come from God and God has the power to accomplish them.
As I create and listen, I will be led
Creativity is the creator's will for me.
My creativity heals myself and others.
I am allowed to nurture my artist.
Through the use of a few simple tools, my creativity will flourish.
Through the use of my creativity, I serve God.
My creativity always leads me to truth and love.
You need several affirmations. There are 10 more examples in the book, but you should make your own.