Brian that is a great question. I just dabble with Judo the biggest thing that I have learned is that your arms bring you to your opponent not the other way around and that when you come into contact with your opponent you want to apply your entire weight to them.
Other than that I will let the Judo experts step in here.
What we think, or what we know, or what we believe, is in the end, of little consequence. The only thing of consequence is what we do. -John Ruskin