So I am self taught, about 3 years now and recently after watching that austrailian guys videos.(forget his name and internet slow... the mystery to mastery guy.)
I stop "tutt" ing out the air i, just blow. let my lips form the natural buzz, or vibration, i give up on the lip buzz thing with a mouthpiece, it might be good for seasoned pros, but i could never do it good enough.
With the lead pipe blowing and further on, one can concentrate on just pushing air and not worrying about the lips.
Side note also maybe it's just my embouchere has just recently developed and im able to play better... either way all is good.