It's not too hard. Jack up the transmission to hold the weight off the mount. First remove the skid plate from around the transfer case. Then remove the bolts holding the mount to the cross-member. Finally, remove the nuts holding the cross-member on.
I like to leave one nut threaded just a little on each side until I'm ready to remove the cross-member. It's heavy and awkward to get the opposite side if nothing is holding it up at all.
There should be two bolts holding the mount to the transmission. Be careful re-installing the bolts, the aluminum case is soft and easy to strip out, and they should probably get a little loctite since you can't tighten them much, I think it's 30 ft•lbs if I'm reading the manual right.