Woody, I did mine myself....

I supported the rear of the cab on 3x2"
See
picture I assume this part of your cab is sound?
I tilted it back until I found it's tipping point,then lashed it to my joists.
Then at the rear I then lowered it onto pads on the chassis axle humps.
I used fairly high density foam.
Just make sure it's well padded.
I had NO damage whatsoever.
Ideally though,you want a minimum of 2 people,I was probably a bit
stoopid !
Maybe that's why I recently had a hernia op!
