I didn't have to remove the mount on my 93 leSabre...but I did have to remove the bolts and move it to one side. Here are my steps: (1) Losen bolts on water pump flywheel while belt still on car. (2) Remove belt (3) Take a 2x4 long enough to cover oil pan and use a jack and jack-off car till engine raises quite high. It helps if you position the jack wheels such that the jack can move side-to-side across the front of vehicle. Just watch when you jack-up that power steer pump doesn't hit cross bar on the top side. (My first mistake was not jacking high enough.) (4) Remove long bolt from center of motor mount. (5) Remove two bolts and one nut from engine side of motor mount. (6) On the frame side of motor mount there are 4 bolts to remove...two on top and two under the mount that are on its bracket that you can't see. Remove them. (7) Remove the 4 previous loosened bolts on the pump flywheel. (8) Take a 3 foot section of 2x4 and whack the corners so its a wedge. Jam it down against the engine flywheel and the frame and move the engine over towards driver's side. If you do it right the mount bracket will separate and shift to the front of the car just enough to expose the two bolts on the pump that you normally can't get to. And it will allow you to remove the pump flywheel. (9) Remove the pumps little bolts and big bolts. I think there are 4 and 4. (10) Remove pump, clean gasket, install new pump and reverse order. (11) Curse GM for making a simple job a real pain in the butt.
By the way....before you start pick up a can of PB BLAST in Wally World's automotive section. Its a yellow can with a bunch of tacky-stuff printed on it. It works great on freeing bolts...just spray on, go have a beer and remove later.