There is not really any particular starting handle position for this move, since it can be initiated from any direction, position or other move that you are doing. One way to learn tip turns (pivots) is to fly SLOWLY in a circle in either direction and keep making the circle smaller and smaller until the kite is pivoting around the tip. You can even make it pivot around the top tip of the upright if you make the circle small enough. Usually it will be easier for you in one direction than the other. Practice both directions so you can do both equally well. Spend some extra time in the direction you find more difficult. On a side note, if your lines, bridle, etcetera, are not all symmetrically adjusted, one direction will always be "a little bit off".
There isn't really a good way to explain how to do this. It will come to you automatically if you just practice making your turns tighter and tighter each time you fly. Basic explanation is that you are retarding motion in one tip while flying the other forward. That means brake to one and forward to the other.
Ladders will look better, once you have your tip pivots down pat, if you abruptly stop all motion at the end of each half-circle. There is no miracle instruction that will allow you to just go out and do this instantly. These are refinements of the moves you are already doing that will become smoother and tighter with time spent flying.
Watch the basic control tutorials and keep an eye on what JB does with his hands.
Happy Thanksgiving.