Vinnie, if you don't have an impact wrench, which would have it off in two seconds, you can pull the pan and block the crank with a chunk of 2X4. Then get the breaker bar. You will need someone to steady the block to keep it from rolling while you are cursing at it.
Or, you could load it up and take it someplace that has an impact gun and pay them 5 bucks to do it.
Jeff