One way to build confidence, according to your textbook, this process is called: visualization.
Visualization can be defined as the process in which a person create an images so as to send or communicate a message.
Based on the given scenario the speaker is making use of visualization by creating a mental blueprint so as to enable him see himself excelling in his speech.
Therefore this process is called: visualization.
Learn more about visualization here:https://brainly.com/question/1822923
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