Not too Bad. have to drop the t case (duh) and just unbolt the overdrive unit from the transmission. Next pull snapring inside that hols in the clutches, pull the clutches. There is a small cover with 2 torx screws on the outside of the cover towards the oututshaft area, pull it. Inside there is a nother snapring, and open that with 2 pairs of needle nose pliers. The whole unit will come out now. You will need a press for the rest of the dissassembly as well as either the spline alignment tool or an old intermediate shaft for reassembly. Basically just pull snaprings and take note of what went where. Pictures are great if you are worried.
Just make sure you have the spline alignment tool or intermediate shaft in the splines before using the press to compress the spring or you'll never get it on the transmission.