I don’t think it would be that difficult from looking at the transfer case and the way it’s fitted in the vehicle, but I’ve not replace mine so I’m not sure.

I had to do some exhaust system work and I removed the support that holds the transfer case to the vehicle, there were like 6 easily accessible bolts to remove and then I think you would only need to remove the drive shafts to drop the unit. I don’t know if the driver’s side torsion bar needs to come out or not to remove the transfer case, I’m thinking it does not, if it does there are some instructions in one of the threads on this site how to do that.

If you're pretty mechanical I'll bet you can do it.