Hello
I have a ney, turkish, also a bulgarian kavel. They are very similar in of the approach to blow into the pipe. Basically, hold the stick at about 30 degrees off of you the center of your face/mouth. Seal a side of the hole, pipe with your mouth, it doesn’t have to be very physical. Then purse your lips like you are going to whistle using your lips. Do short burst of air, otherwise you’ll get dizi. Then angle the air stream sort of across and into the pipe.
You’ll find that if you actually do whistle, into the pipe you’ll get a better feel for this approach. Remember that a important part of this is in getting a decent seal of around half, more or less of the “light” seal, no need to think that pressure equals seal, it’s a very easily attained, just move the stick around as you huff out a bit of airstream.
The speed of the airstream will also be important, that’s where tone comes from as well as effects. Between varying the diameter of the airstream and the speed, somewhat a kin to force of the airstream, the various octaves come into play. It is much easier to play in the higher octaves then the lowest octave, where a lot of the mystery sounds dwell. From what i’ve ascertained the lowest octave is all about relaxing the lips and enlargening the diameter of the lips, thereby increasing the diameter of the airstream.
After a bit of time you’ll get more comfortable with “the posture” which really isn’t that rigorious. The biggest trip for me is the stretch between thumb hole and the “trad” six holes on top.
This technique works well on other flutes and whistles though the intonational variances are all out of wack, but it’s still fun.
Take the fipple off of a whistle, cover the holes with the fingers as you usually would, instead of having the whistle perpendicular to your face/mouth angle it off at about 30degrees. The pipe won’t be point straight down either. Try this, put your hands at your mouth in a cartisian plane, cross or the a lower case “t”. Move your hands 30 degrees or so to the right, if you right handed. In the same way move both "planes of the cross, “t” 30degrees too. The “30” is not a hard and fast rule. Noodle around and you’ll find it. You can blow into either end of the whistle, intonational differences are apparent.
This works on concert wooden flutes quite well too.
The blow is not hard and at least to me require less air than the flute or whistle. It’s all about airstream consistency and attack. Also the smaller the instrument, typically the easier it is to play. As lower scale instruments require a stronger lip control with larger diameter and smaller instruments are much more forgiving.
ymmv
magical instrument…