Is this job too big for a gas tree pruner?

A tree about 10 feet outside my yard was at a 45^ angle over my yard
for the last 6 months, and yesterday some time, it went down a bit
lower, not it's maybe a 30^ angle with the ground. The tree is 35 to
40 feet tall, if it were upright, and now its trunk and branches 12 to
18 feet above the ground. The tree branches are resting on some 20'
high bushes in my yard, and I think it's still held up by the roots
too.

What is a good way to cut it up, while it is still up there?*** That
is, cut off ends, working back to my fence (and then it can be cut off
at the base.)

Branches are 2 - 4" thick and the trunk where I want to cut it is 3 -
7" thick.

I have a couple small and medium-small electric chain saws, but no way
to get them up that high**.

They rent gas driven tree pruners, with telescoping poles, which I
think will reach high enough if I'm 5 feet up a 6 foot ladder. Is
this job too big for them. The engine is at the bottom and the chain
is at the top. Maybe it will stall or won't cut for some reason?

Are there electric tree pruners that might be lighter, that maybe I
can find for rent if I look long enough?

**Or could I tie one of my small electric chain saws to my own
telescoping pole

Gas or electric, I guess the weight of the bar and blade (and electric
motor) is what helps the saw to cut.


***I can't cut it off at the base in order to lower it, because then
it will fall on my new cherry tree, whose cherries are just turning
red, and on my fence.

Thanks.