It is a pain in the butt, it took me about 5-6 hours for removing both engine mounts and installing the new ones from Rob. Rob sells the OEM Mercedes ones. If you are going to do this get the OEM ones not the cheaper ones on Ebay. My passenger side mount was still good but the driver side was toast. I replaced both anyways. I don't think these mounts are made to resist lifting of the motor on the driver side, but there doesn't seem to be a good aftermarket or diy alternative that lasts longer than the OEM ones. Steve is right when he says forget about torqueing them. I used an open end wrench and blue locktite and then double checked them after one week. It was still tight. Good luck