As part of tomorrow's "removal" operation, I have to jackhammer a
brick wall.

This is done to facilitate removal of three machines (autoclaves),
each about 5 feet diameter and 30 foot long. They are mounted "through
the wall", so that 90% of them are outside, but the access door is on
the inside.

I told the company that I would bring my tow behind compressor and
jackhammer to hammer out about a foot of bricks around the autoclaves,
so that then I can pull them out without having the wall follow them.

OK, so far so good.

Now I want to make sure that as I am jackhammering the wall, it would
not suddenly crack, collapse, or otherwise give me trouble. This is a
regular overlaid construction brick wall, partly cinderblock and
partly brick.

Any experiences, am I overthinking that? Can a wall suddenly crack
from local jackhammering?

Secondly, a jackhammer is very heavy, maybe 80 lbs. Obviously, no one
can hold it horizontally for a long time. How do people deal with
this? I wanted to have my partner support it with something suspended
from forklift forks. Makes sense?

Note that I do have a jackhammer for a bobcat, but the access is no
good and it will not be able to work in that area.

i