Micro-exposure is a technique that involves gradually exposing yourself to the source of your fear in small, controlled doses. For example, if you have a fear of spiders, a therapist might start by showing you a picture of a spider, then progress to having you be in the same room as a spider in a cage, and eventually work up to holding a spider in your hand.

Similarly, in door-knocking, micro-exposure can help you overcome your fear of rejection. Start by knocking on the door of someone you know and feel comfortable with, and gradually work your way up to knocking on doors of strangers. You can also start by rehearsing what you will say before knocking on the door, and then gradually progress to improvising your pitch. With each successful knock, your confidence will grow and you will become more comfortable with the idea of facing rejection.

Remember, rejection is a natural part of life, and it's important to not let the fear of rejection hold you back from achieving your goals. With micro-exposure and practice, you can develop the resilience and confidence to handle rejection in a healthy and constructive way.