You may not even verbalize the Affirmations, they are necessary to create the direction of the Magical Program. It's like a regulator of railroad track networks, if it's easier for you to understand. You attune with the raised Energy, give it a Mental Structure and then direct it. You can say the Affirmations to yourself (in your Mind), here it is just important to understand clearly what you are Programming the Energies for.
What you really need to watch out for is the Vibration of the Power Words. The Power of Vibration is undeniable and incredibly Sacred. It really does make a difference.