How to break heads loose?

Thanks for all of the suggestions. I will find out in an hour or so if I can do it with one of these ideas. Mainly I wasn't sure how violent I could get with it - like "Should I use a large Ford Tool on it?" - or if I was likely to damage them. Looks like I can be much more aggressive than I was yesterday and use a big Ford Tool.

Have a great evening everyone!

Jim