Since there are so many steps, such as writing an essay and obtaining letters of recommendation, experts say a good way for students to get started is to create a to-do list during their junior year of high school.

"Once you can see it visually, the number of tasks and a schedule to do them, it simplifies a lot of things," says Christine Chu, a premier college admissions counselor at IvyWise, a New York-based education consulting company. "It will take away a lot of the anxiety."

Though there is often prep work that happens beforehand, students generally begin filling out college applications the summer between their junior and senior year of high school, experts say.

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