Mari, I would recommend going full time while you're in college, so you can graduate in your new name and identity. Changing your name on a degree, in my experience, isn't possible. I tried doing it for my associates and they wouldn't do it for any reason.
Anyway, college is a great time to transition. I started HRT in the middle of my spring semester, took the summer off between sessions, and came back to school full-time as Jennifer in the fall. Nobody gave me a hard time. I passed fairly well after a few months on hormones and was able to use the women's restroom without a problem. I was able to get a special housing situation on campus and a lot of friends and faculty/staff and professors were really understanding. I was able to socialize as myself with everyone around me, while I took care of legal name change and such. The following semester I updated my info with the college, and I will graduate with my degree in my actual name in December this year. Granted, your mileage may vary, but you're very anonymous in college. Unlike high school, most people are very mature and doing their own thing while in school. Those that don't agree with your transition tend to keep their mouths shut and their opinions to themselves. At least this has been my experience.
Best of luck to you. *hugs*