Answer:
Number 1: He doesn't know if he'll be accepted there.
Number 2: He is afraid of the Sorting Hat landing him into Slytherin.
Number 3: He doesn't know basic spells, potion recipes, etc..
Number 4: He's afraid someone might catch him walking through the wall in platform 9-3/4.
Explanation:
The moon experiences many changes throughout the story.
At first, the moon is a shimmering ivory figure.
She then becomes blue, veiny, and wrinkled.
Later, she starts to fade, and become see-through, and her eyes turn indigo.
She ends the story as a sparkly silver pile of embers.
It is to give your own personal experience or write about anothers experience.
