Felling a Dead Old Tree

Where to start. Now, I've got some land...a place in the woods where I can go and camp, build, train Tai Chi...
But except for a small gravel pad next to the road, there is nothing level.
After walking the property a couple times, I found the most likely place to transform, without having to cut down any good trees and move as little dirt as possible.

After getting started, stringing up a tarp and leveling a small area, I realized that there was a huge dead oak close by. I decided to cut it down, but first I had to clear the way. This dead older tree came down first.