For the backyard mechanic without access to an air wrench, you need the immobilizer tool ( a big nut welded to a flange that will accept a breaker bar) that you insert into the receptacle built into the crank pulley, impact socket, impact extension (only if you absolutely need the clearance), hardened breaker bar (2 of them, one to hold the immobilizer & one to put on the crank bolt), a jack stand or something you can use for a fulcrum & a 4 foot piece of gas pipe to extend the breaker bar. Put it all together and pop the bolt loose. Not fun, but do-able.