I found replacing the rear mount was much easier with two people. we used a universal joint, a 12" extension, a 12" wobble extension, and a 1/2 socket wrench with a 3' breaker bar too get it loose. one person held the socket in place from under the car while the other cranked on it. Also had to Jack the motor up just a to get the mount with the inserts back in place as the inserts made it just wide enough to not not fit back through the opening we had slid it out.
This job was the biggest pain in the butt I've ever done on my Mazda and after we got the old mount out we realized it was shredded and had to put it all back together since I didn't have a replacement. So I did this job twice. I was able to get it done with only removing the plastic intake piping, I did not remove the manifold.