WoW!!! That's BIG - for sure. When we burned wood - it was our ancient Ponderosa pines. That's all I have here on the property.
I quickly found that the really big trees took too much time. Just handling/fooling around with the large pieces.
I dropped down to trees 20" or less on the butt. I was able to manhandle them up onto the splitter without any added help.
Thereafter - the only time I dealt with the really big ones - when they would fall of their own accord.