Hi there,
The only advice (from experience) is with stress, such as college, etc. you can risk triggering things while cutting back on meds. I am fortunate to only have to take Lamictal for the Bipolar, and only 200 mgs per day, I too was working on gradually getting off of them but things at the present time in my life caused me to decide on waiting to cut back. So do not try too much too soon is my personal advice, the time will come when you will feel when the definate time is, but also realize if meds can give you stabilization, and a better quality of life than when not on meds for Bipolar, there is NO big sin to take them.
Over time I learned to accept the fact they may be life long, I said to myself, "that is no big deal, I rather to take them than the nasty alternative some of us have to face.
Whatever you and you pdoc do, I sincerely wish you luck with this, I know it is a hard thing to deal with.

Take care,
DE