Not at all.

Step One: Firmly hold a single book.
Step Two: Find a corner of the book.
Step Three: Place the Book Edge on the door.
Step Four: Applying a large amount of pressure, pull the book down.
Step Five: Repeat Step Four, only switching the direction of the book (i.e. Down< -- >Up)
Step Six: Repeat Step Five untill you see Daylight.
Step Seven: Repeat on another part of the door.