Pre-Set-Up
First, just blow air through the mouthpiece. Don’t blow hard – just like saying “whew” on a hot day. Don’t try to make a “trombone embouchure” – just let the mouthpiece be a funnel for the air. Place the mouthpiece near the middle of your lips – it will eventually "find its own way" to your personal “best” spot. See Mouthpiece Placement. Do this several times.
Second, add a little Blocked Buzzing. Completely seal the end of the mouthpiece with a finger and gently blow against it. Your lips should seal (hermetically) against the mouthpiece rim. Don’t blow hard – just enough to engage the embouchure muscles. For this purpose, don’t hold this too long. Gently blow your finger out of the way and let the air freely flow through and out of the mouthpiece – no lip vibration – yet. (This is similar to a tongued attack.) Do this a few times.
Third, repeat; but now let the lips to be drawn into vibration by the airstream (see Tone Production). Allow them to vibrate, don’t “make” them vibrate. Whatever pitch is easiest for you. Sound should NOT be immediate – airflow first, then tone. There may be several “air-balls” before you get a tone. Don't buzz too loud, too soft, or too tight. See About Buzzing.
Finally, do some breath attacks without the finger. No articulation – no too, poo, goo, etc. – "whhhhh . . ." – like Stewie from Family Guy! (This is a good example.) When those are working, proceed to the “Set-Up Routine.” (NOTE: there are more practice resources.)
Second, add a little Blocked Buzzing. Completely seal the end of the mouthpiece with a finger and gently blow against it. Your lips should seal (hermetically) against the mouthpiece rim. Don’t blow hard – just enough to engage the embouchure muscles. For this purpose, don’t hold this too long. Gently blow your finger out of the way and let the air freely flow through and out of the mouthpiece – no lip vibration – yet. (This is similar to a tongued attack.) Do this a few times.
Third, repeat; but now let the lips to be drawn into vibration by the airstream (see Tone Production). Allow them to vibrate, don’t “make” them vibrate. Whatever pitch is easiest for you. Sound should NOT be immediate – airflow first, then tone. There may be several “air-balls” before you get a tone. Don't buzz too loud, too soft, or too tight. See About Buzzing.
Finally, do some breath attacks without the finger. No articulation – no too, poo, goo, etc. – "whhhhh . . ." – like Stewie from Family Guy! (This is a good example.) When those are working, proceed to the “Set-Up Routine.” (NOTE: there are more practice resources.)
For You Commuters
Keep a spare mouthpiece in your car – it need not be exactly the same size. Do the Pre-Set-Up routine. When you get to the end, do several one octave mouthpiece "sirens" in different keys and registers. Here is another good example.