if you see the engine bouncing back and fourth when you shift from P to R them to D, the lower mounts are likely shot.
when you change the mounts, un bolt the dog bones, this lets the engine jack up easier from the bottom. then flip the dog bone bushings, that also helps a lot to limit the movement.
if you put the car in gear then if the engine is cocked a bit, twisted in the bay, the lower mounts are dead for sure. the pass side will litterally move to the front, or back, depending what gear your in, F or R.