A book in which a character is nervous, scared, or anxious about preschool is a good way for a child to be introduced to preschool. Since the character in the book will overcome his or her feelings, your child will learn from the storyline. You can also practice smaller transitions at home, such as from activity to activity, and work your way up to bigger transitions. You can also talk about activities that your child will do at preschool to get them excited, such as socializing, hand washing, and lining up. Every child responds to transition periods differently, so keep that in mind as well.