Flanso's got it!
OK saltyreefguy; here's the deal. You're not going to get that bolt off. You can get a breaker bar 20' long if you want, it won't work.
The absolute easiest, best way to do it is this and you don't need anyone to help you:
1) get the right socket, preferably a six point 1/2" drive, but a twelve is fine.
2) I believe it was 6 inch extension.
3) 1/2 inch drive breaker bar, about 18 or 20 inches long.
4) get the socket on the nut fully and make it so that the breaker bar is not hanging straight down, but is swept back and it's handle area up tight against the shallow 'V' made by the lower control arm with the frame. You want that bar to be sitting up to the 'V'. an inch or so away is still OK.
5) Double check that the socket is pressed onto the bolt.
6) When you're satisfied that it's all set up, gently sit in the driver's seat, put the key in the ignition, take three long breaths, now turn the key to on position (just before start).
You're getting ready to just bump the starter.
7) You want to hit that start all the way and then come right back. Don't be a wuss. Turn that key all the way and then shut it off. Bam Bam just like that.
The first time I did mine, I thought, "Did anything happen?". I walked around the car and looked down to see the breaker bar hanging straight down. I grabbed the breaker bar and found that the bolt was perfectly loosened, and it was all free and perfect, ready to continue working.
That's how you do it. An air wrench won't work. A breaker bar won't work. And messing around trying to hold the crank is not a good idea.
There is a tool that Toyota uses to do that and it's a very simple tool, but it's a special tool so it's kind of hard to make. It has 2 pins coming out of it and it goes into the pulley and into the 2 holes in there but has a wide enough spread to allow your socket to fit between. You hold the crank still with the tool while you torque off the bolt.
The starter method is great. Once you do it you'll see. That starter simply puts a tremendous force. All you have to do is hold the bolt.
Good Luck! :D