For one thing, the new account could decrease the average age of accounts on your credit reports — a higher average age is generally better for your score. Additionally, if you applied for a private student loan, the application could lead to the lender reviewing your credit history. A record of this, known as a “hard inquiry” or “hard credit check,” remains on your report and may hurt your score a little.
Next, estimate your monthly spending habits for other expenses such as gas, groceries and entertainment. Create a limit, based on your income, of what you can spend in each of the different categories of expenses. For example, if you tend to spend $400 a month on groceries, try to stick to $300 a month on groceries by making changes like buying generic brands, using coupons, and resisting impulse purchases.