The most challenging thing a writer could face is writing something "UNIQUE" and "ORIGINAL". With tons of books published and written on a daily basis, it's now hard to come up something so original and one that people will like.

A writer could just copy parts of a story from other books but people won't really be into it (especially if he/she is a new author). A writer must come up with something original and interesting in order to get his/her name up.