That first video -- don't be fooled by it. It may be his first flight with a Rev, or maybe that particular Rev, but he's definitely no stranger to quad-line kites. Nobody, and I mean NOBODY, flies a Rev backwards and sideways across the window moments after the first time they ever launched the kite. I sincerely hope you guys don't judge your progress by what you see in that video. It takes at least 20 hours solid flight time to start getting near that level, sometimes more, except for super-talented "naturals" like me. Just kidding. Took me about 100 hours of trying to learn on my own to get to that level. If you are close to that already -- well deserved kudos to you.
As Wayne mentioned, especially on JB leaders, start at the farthest knot out and start bringing it in until you can launch. However, with additional time under your belt, start going out towards that far knot for additional control and more ease of holding the inverted hover. It will also help relieve much of the discomfort in your wrists and forearms when you've been flying for several hours. More stamina for extended fun time at fests and such. When you want additional lift and/or speed from your kite, learn to move your body rather than your arms for the same reason.
Smile, have fun and don't forget to breathe.