How can I lower the interest rate on my student loans?

I owe about 35,000 in stafford student loans (17,500 subsidized and 17,500 unsubsidized and want to lower the interest rate. Right now it is at 6%. I'm still in school but at the current rate I am being charged about 3.00 a day interest on the loans that the the government isnt paying the interest on. I've heard of consolidating but I don't really know how it works or where I should go to begin or even if I can consolidate since I'm still in school. Help!