You don't need this but it will make things ALOT easier.

http://cgi.ebay.com/ebaymotors/Astro...spagenameZWDVW

There are quite a few kinds out there, keeps your crank from moving. Once you have it locked in, you should be able to break it free. I used my DeWalt impact gun, took a few hits but within about 10-15 seconds the bolt broke free. Was the best $30 i spent.