1999 Saturn engine and transaxle mounts

In my 1999 Saturn SC3 I get a lot of vibration when the engine is running. Sitting inside in park with the engine idling I feel the vibration and can actually see the mirrors vibrate. Since the engine seems to be running ok, I think the cause is the engine mounts or transaxle mount. I would like to inspect the mounts, but I am not sure how many there are and the location. On the passenger side I see the top mount and a bottom mount mount below the drive belt. On the driver's side I see a transaxle mount. My question is, are there any other mounts that I should inspect? I would also like some instructions and tips on replacement if anyone has them.