Peter Johnson wrote

Saw a chap take down a big conifer four/five years ago. He used
four saws to do the job. A small one at the top, then working down
until he used the big one to cut the trunk. Very impressive to watch.

Yeah, watched a pro take down a whole line of very big palm
trees along a neighbour's back fence line with no access at all.

He did it with spiked boots and a belt chain and a chainsaw,
starting at the top and then taking off big chunks of the
trunk as he came down the trunk. Should have videoed it.