When I was in college and it was so hard---I attended a private engineering university and those people were SMART ---when I would get overwhelmed my dad would say, "Don't think about it, just DO IT." (This was WAY before Nike commercials).
So now if I get overwhelmed, I just think to myself, "Don't think about it, just do it" and it really does work. Sometimes we spend too much time "thinking ourselves out of a way to success".