How would I find the half-reactions?

by Bipolarity
Tags: halfreactions
 P: 783 $$2MoS_{2} + 7O_{2} \rightarrow 2MoO_{3} + 4SO_{2}$$ So here I have a redox reaction, it's already balanced but just for kicks I'm trying to find the half-reactions so that I know what is happening. I'm having some trouble though as I don't know what's being oxidized and what's being reduced. Any advice? Thanks! BiP