"Hot launching" is per definition when you have the LE pointing up at the sky, dead downwind, and fly the kite straight up.
I believe this is not what you ask about, but the reverse launch instead
I reverse launch extremely often, and I can see we do it very differently.
For me: Hold the bar with my left hand, and both rear leader lines with my right (or your left, your STRONG arm), pulling (or walking/running if really light) the kite up backwards.
The kite will turn to one side or the other by itself, when you just wait, and dont pull too hard, as then the kite collapses - dose it gently.
If you need the kite to turn to one side because of obstacles - well, not easy unless you use both hands on the leader lines (which I DONT like, as I want to have full control immediately with my other hand, very important, and of course crossed lines).
BUT, the solution is simple - if it turns to the wrong side, you just wait, keeping tension on the rear lines, and the kite will not fly up, but sit deep and you simply wait till it is directed either straight up, or to the desired side
Starting a reverse launch is done by having the kite diagonally to the wind, and then pulling the leeward rear line to slide it deeper for the reverse launch, we all know that.
But another way that works, is to slide it only a fraction, and walk towards the kite so it is partly on its back.
Now, in really light wind, you can pull the LOWER rear line, while also having tension on the bar at the upper rear line, to get the kite standing up on its side and even pointing a bit up, now depower the kite flying it up - and voila - you can launch in almost no wind to the desired side free of obstacles, in full control, and without the risk of a sudden gust pulling you
Works even better than a reverse launch most often - but in the utmost marginal winds a reverse is usually the only way (say 5-6 knots of wind), and also needed at spots where almost no wind at the ground, eventhough sufficient wind up higher.
The reason why I NEVER launch without having one hand on the bar, is because I want to be sure to be able to steer the kite away from obstackles (people, trees, boat masts etc), besides being sure there is no lines wrapped around something as could happen easier if you let the bar "dangle" - I never do this...