It is RIGHTY TIGHTY, LEFTY LOOSIE unless for special apps. Your drain
plug unscrews counter clockwise or to the left as you face the bolt.
Generally it is better to take a hammer and rap the end of the wrench
rather than muscle it off. That was the only way mine would come off.
Didn't tighten it that much so now it will come off a lot easier.

If the bolt head is deformed, it may have to be drilled out or the oil
pan removed to get at the bolt. Not pretty. I guess the worst would
be a new oil pan - you will have to buy a gasket and a new drain plug
as they come seperate.