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The secret to going from a credit score in the low 600s to excellent—without ever really checking it

There are a lot of different ways to improve your credit, but this personal finance guru sticks to one particular habit that took her score from fair to excellent.

Photo courtesy of Kara Stevens, The Frugal Feminista

Have you made a major jump in your credit score and would like to share your personal journey? Email reporter Elizabeth Gravier at elizabeth.gravier@nbcuni.com if you're interested in being featured in CNBC Select's new "Credit Scores: Then and Now" series.

Kara Stevens recalls her credit score at its lowest point being somewhere in the low 600's. When asked to pull her latest score for this story, her score by Equifax (one of the three main credit bureaus) calculated an "excellent" 766 using the VantageScore 3.0 model.

Below, Stevens, who is founder of the personal finance and lifestyle blog The Frugal Feminista, shares with CNBC Select her personal credit journey and the secret to her big credit jump.

At first, Stevens didn't pay anything on her credit card bill

Stevens graduated from college with a couple thousand dollars of debt on her first-ever credit card (a Discover card) and student loans. She wasn't paying back either, until she realized how quickly that mistake added up.

"I remember in college I would just buy things and assume they were automatically taken care of," Stevens says. "I'd open up the bills and see that the balance would keep going up even when I stopped buying things because I was getting all of these late fees." 

She credits her mother for helping her realize what was happening. "It never really dawned on me that I had to actually pay the money back, and that the bill was a financial consequence, a penalty, for not doing it," she says.

But her journey to good credit didn't happen overnight

Stevens' credit score didn't change overnight — in fact, she estimates it took about seven years to become excellent — but she quickly read up on credit once she came to the realization of its importance.

Stevens remembers visiting the library and reading "Girl, Get Your Money Straight!" by Glinda Bridgforth as well as other books on credit responsibility.

"That book helped me really understand that there are books out there about personal finance specifically catered to women," Stevens says. 

She credits books to helping her understand the relationship between good money behavior and a successful future. Stevens says she also learned about the power of credit and credit scores, which was what motivated her to check her score for the first time ever and realize it was in the low 600's.

"That's when I first started to think about money management and the indicators that demonstrate financial health," Stevens says. This was her realization that a good credit score matters.

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Her secret to a good credit score without ever checking it

Though a lot of experts suggest you constantly stay on top of your credit score to know if it goes up or down, Stevens improved her score while barely checking it at all, except for certain milestones: a new job, getting married, signing for a new apartment.

But she did abide by one rule, and it's been her secret to raising her credit score from just OK to "excellent."

"I knew that if I paid my credit in full and on time, my credit score would go up, and that's always been my learning from the books," Stevens says. "I felt like checking it wasn't necessary if I knew I was doing the work of getting good credit."

Stevens notes that she stuck with her Discover card for a really long time and opened up a Visa card years later to get a better interest rate. She said she never closed her oldest Discover card based on strategies she read about the importance of showing a long credit history.

Her number one piece of advice to improve your credit score? No matter how often you check it, make sure your credit card payments are made on-time and in full.

More from the "Credit Scores: Then and Now" series: This expert's credit score dropped to 547 during the last recession but is back in the 800s—here's what she did

Information about the Petal® Visa® Credit Card and  Capital One® QuicksilverOne® Cash Rewards Credit Card has been collected independently by CNBC and has not been reviewed or provided by the issuer of the card prior to publication.

Editorial Note: Opinions, analyses, reviews or recommendations expressed in this article are those of the CNBC Select editorial staff’s alone, and have not been reviewed, approved or otherwise endorsed by any third party.