I used my lug wrench (T type)on center bolt which a friend holds firmly in place. Then use a breaker bar with socket on bolts connecting the camshaft pulley wheel and undo that way. It is a tight fit with two sets of hands in the wheel well, but it works and you do not have to get an impact wrench or take off the valve cover.

I also tried to remove by putting the car in 1st gear and have heard of the starter trick, but these did not work for me.

Good Luck