Like mentioned above, support trans/motor after jacking weight off of skid plate. Remove skid, vacuum lines, vent, driveshafts and linkage. I did not support transfer case on it's own, removed the 5 or maybe 6 bolts? and slowly pulled transfer case away from trans and lowered by hand. Not hard at all but maybe 6-8 hours start to finish including tool search and cleanup. I would support Jeep on four good jack stands to make it easier. Good luck. Almost forgot, I have a 1" body lift that made it much easier to reach top bolts on transfer case, maybe remove shifter boot for access.
kevyj87 '87 I6 5spd, 215,000+ miles, Herced, Nuttered, Weber, HEI, RE 4", 1" BL, 4:11's, np231, 33x12.5's, SYE & shaft, 1" brown dog mm, home made bumpers front & rear, Ramsey 8,000lb winch