If you feel that you can't get it off yourself, let a pro do it. Two years ago, one of the lugs on my 190 was very stubborn. After 5 minutes of pulling and yanking, my friend came in and he stepped on the wrench putting his body weight on it. It caused the head of the lug to snap right off.
Had to take it to a pro to get whats left out of the hub. Wish I just took it to a pro in the first place with such a stubborn bolt.