Yes, a six point socket is the only tool that should be on the drain plug, and always use a new drain plug seal. You don't have to 'overtighten it'.
When I have a rounded out plug at work, I give it a gentle zap with my air chisel. Just feather the throttle and it comes loose every time. Do the same thing with stubborn allen bolts... The real trick is not to get them rounded out in the first place, that is why using the correct tool in the first place is so important..