Read entire thread.
Here's my contribution.
If you can get as much removed as possible above ground (I would use a chainsaw for this myself) there is a product you can spray on any leftover exposed wood (including the cambium tissue) that will kill what's leftover so it will not re-sprout.
This is important when you have a species that doesn't die easily and wants to keep re-sprouting foliage - even after you've amputated everything above ground.
The product is called Tordon RTU. You can buy in in a quart size and it is used straight - not diluted (RTU = Ready To Use). Around $25/Qt.
I use a small spray bottle with mine and just spray any exposed tissue I can see and do it right after cutting so the cut is fresh.
Sawzall is too much work for the whole thing - that's where a chainsaw comes in.
Dow AgroSciences RTU548 Tordon RTU Herbicide QT Size