Sam - Do you have to remove the entire clutch assembly, or just need to replace the drive disc? You can do the latter job in-situ, but anything more requires the engine to be unbolted and moved forward.
Your tractor is fitted with the improved, later design clutch, with a 2-piece disc, that allows the disc to be removed after just the transmission case cover is removed. Here is a SM article that will assist ..
Page 1 - http://img254.imageshack.us/img254/7892/rd6clutch1.jpg
Page 2 - http://img254.imageshack.us/img254/7423/rd6clutch2.jpg