You can certainly change the engine mounts by lifting the engine. Use a decent size piece of wood on the bottom of the oil pan as opposed to merely sticking a bottle jack directly onto the pan.
For the back mounts, same deal. Remove the bolts on the mounts, and jack up at the bellhousing to raise the transmission. You will likely run out of room and start hitting the floor of the jeep with the top of the transmission. So ideally you loosen off the 4 bolts at the frame on the skid plate crossmember and let it drop a bit.
It's been a while, but isn't one or two of the bolts for one of the rear mounts hidden under the skid plate? If so, it has to go too.
If you have an impact gun, it will make short work of most of those bolts. If you don't, ask santa for one of the dewalt 18v (or for a bit more money the 20V) impact guns. They are indispensable for driveway work and you don't have to F-around with cords or hoses.
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