The sago has a new home in the front yard now.
We dug a trench all the way around about 18" from the base of the plant and about 18" deep. Then we shoveled the dirt from underneath the plant until it was lose. Next we slid a tarp under the root ball and lifted it from the hole. When we did that the dirt crumbled away from the roots. That plant had a root system that would fit in a 5 gallon bucket. We didn't cut hardly any roots digging it out. I was surprised that after 5 years there wasn't a more extensive root system.
Anyway, we had prepared a large hole in the front yard for it beforehand. I put 2 cubic feet of potting soil mixed with some of the soil from the hole along with a handful of palm food back in the hole around the roots. Then I mixed up 4 gallons of water with some B1 and a tablespoon of Super Thrive for it. That's all I know to do for it, I hope it works!