Timothy Gallwey's "The Inner Game of Tennis" suggests beginners can make rapid progress if, instead of trying to perfect their game analytically, they listen to the sound of a ball hitting a racket in a "good" shot and try to duplicate that sound. Somehow, their bodies do what is necessary to produce that sound when they hit, resulting in more-or-less correct form. It isn't magic, but it's helpful.
I'm playing in several amateur bands. I've noticed in many cases the musicians seem to blast away without any thought about tone quality, clean attack, smooth transitions between notes or other details.
If you form a clear idea in your mind of the sound you want to hear, the sound that emerges from the bell will be better than it would have been if you weren't thinking of anything at all as a model or target. It might not match your ideal concept, but it will be an improvement over random blowing.
It isn't a question of becoming a great player overnight. At any level, if you think about what you want to hear before you blow, the result will be better than if you don't; even the first time you try it. If you make this a habit, your playing will improve steadily.
I have some ideas about concept for #euphonium and #trombone and would welcome feedback and criticism. https://neopragma.github.io/dnmusic/concept.html
#musiclessons