First tease out the roots with a hook and trim as you go with sharp scissors.
Pruned out large roots that point downward and save all root headed laterally.
I removed almost 75% of the root mass. I really need to stunt this vigorous tree.
Tie root mass to container and add fresh fertile soil.
Now it's time to top the tree. Above is before and as you can see, I didn't remove nearly as much of the branches as I did the roots.