You are right. I bought this lens for a trip last year to Yellowstone, and then was not able to go on the trip. I have used it only a few times. If it takes years to master it, and dedication, then I am not sure this lens is for me. I have other issues in my life that need attention. What makes this lens so difficult?
Of course, now I have to decide to go to Yellowstone or not. The other approach is to go to Yellowstone as planned and enjoy the view, take photos with this and my other lenses, and not worry so much about taking perfect photos.