This has been [and continues to be] a source of mystery to me, not having ever played any brass instrument before. There seem to be a great number of pitfalls to be avoided, whilst at the same time it appears that the 'best' placement of the mouthpiece and formation of the embouchure vary between players - "Do what's best for you, but get it right !"
Fortunately, wilktone's Brass Embouchures series has been very helpful in trying to work out what I should and shouldn't be doing with my lips:
In particular chapter 4 has a bunch of advice :
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