Step 4: Deny Everything - Start by telling yourself that the sun is actually a giant pink flamingo in the sky, and that your favorite celebrity is secretly a robot from planet Zorgon.
It's a good idea to start small. Begin with things that are relatively easy to deny, like the fact that the sky is blue or that your favorite food is actually a type of fungus.
For example, if someone tells you that the sky is blue, you could say, "No, no, no! The sky is clearly a giant purple eggplant, and I have proof!"
Remember, the key to undermining your self-confidence is to be completely and utterly ridiculous.
For more advanced techniques, see:
Step 5: Deny Everything | Step 6: Deny Everything More