I used a floor jack, 2x4 and a towel for padding...my oil pan was not injuried.
I have done 2 sets, both Rustys on an 88 MJ and my 91 XJ. Did not remove the manifold (although it may have made the job easier) but the drives side is certainly the harder one.
Rustys mounts seem very strong but they are pretty stiff when first installed. They have been better with the automatic, a little harsh with the 5-speed. BTW I had to trim the bushing on the driver side both times, it was a little to wide.
Currie makes aftermarket mounts as well I believe they even offer 1" taller mounts to help the driveline angle of lifted XJs.