Here we go! Another one of Casey's ridiculously counter-intuitive posts. Start at the end. It doesn't get more contrarian than that, does it?
This is the way I was taught to practice, and I continue to do it because it works. Time and time again I share this practice technique with my students, and I can always tell when they follow my directions because their playing sounds smoother and more confident. Learn how and why starting at the end works so well. Don't worry, we won't be going backwards.