Diesel Technician with 3 decades of experience on large trucks, my view of easy and difficult are far different than most. To sort of quote, Spicoli, "I've got an awesome set of tools".
In my world it's pretty much all manual shift, most of the things they call "AUTOMATICS" are nothing but a manual shift trans with some electrical parts that do the clutching and shifting for you. I've never been inside of a small car trans aside from a "shift kit" install 12 years ago. Always heard they were this nightmare that I should never mess with. This thread proves that is not true at all. I now know that I do far more difficult tasks on a daily basis than a 4L60E could ever pose and I thank him for that.