Unlike undergraduate students, graduate students are not eligible for subsidized loans. Any loans taken out as a grad student are unsubsidized, meaning they start accumulating interest immediately.
Why put off for tomorrow what can be done today? Carefully assess and fully take advantage of the grace period that you have before payments are due after graduation, which is normally 6 months. Create a fresh and new budget for yourself for each pay period and trim the fat in regards to less important things that you find your money going towards.