I always coat the front exhaust nuts and screw with copper anti seize paste. They will come off like butter for the life of the car afterwards. I also smear the gaskets with the paste and I can re-use them as they come off easily. I've had a lot of driveshaft vibration issues over the years and I've taken the exhaust and driveshaft off dozens of times. Using the anti-seize paste has always made the task very simple next time.
Agree with deadfish on replacing the transmission mounts while you are in there. To disconnect the guibo you will have to remove the driveshaft completely. You will damage the center mount of the guibo/driveshaft if you rotate the transmission down a long way if you don't do this.