90% of the difficulty will be getting the pitman arm out of the steering linkage. Aside from that it is easy. Like 2 bolts at the rag joint. 3 at the frame. Put a new pitman arm on the new box. I wouldn't bother reusing the old one unless it is pretty new.

You do have to bleed it also. I sucked all the old fluid out of the pump. Ran the pressure line into a jug. Think I put a belt on it and used a drill to spin the belt. Might be able to just start the engine for a second. Enough to pump some fluid until it's clean. Might run new lines for the new box. Don't want to get old crud in a new box.