I haven't done one yet, but I hope to eventually. I have a tough time getting my head around "where do the lines go". So I have done some practice on the beach with trainer kite (2m inflatable) to figure out how to get under/around the lines. Took me 10 or more tries to get it figured out without crashing the kite. A bit like doing backrolls, concentrate on not pulling either way, keep bar straight. Toeside to heelside was way more challenging.
On the water, I haven't yet tried on foil. Did it with surfboard just to get a feel (strapless) for the motion, not even close to making it, but was useful to get a feel for the kite's movement.
Now to grow some balls and try it with foil ... but plummet's description is what worries me ... it's one thing for kite to loop and superman downwind with without a board ... another to do it with an aluminum ax between your legs.

PS Here's a video showing the move with 2 frames side by side, showing kite and rider at same time, slow mo.....really helpful, hope the link works
www.facebook.com/foilingbasics/videos/1409164912492080/