The 27mm bolt is on there at a couple hundred ft/lbs. If you don't have a 1/2" impact gun then I'd suggest you get hillbilly on it. With the pan off, wedge a piece of 2x4 between the crankshaft and block to hold the crank while you use a breaker bar to get that bolt loose. Don't worry the wood is soft enough to not hurt anything but make sure you're not interfering with the oil pump when you have tension on the 2x4. With the bolt off, the hub usually isn't terribly tight on the snout and may come off by hand with a little coersion. If it's stubborn you may end up putting two pry bars behind it to wiggle it off. If it is very stubborn, you may want to find a puller to pull the hub but I doubt that will be necessary.