I'm just coming back to playing after about a three year break. As my embouchure is firming up again, I'm conscious of the einsetzen, ansetzen problem. I start out with my lips and mouthpiece fairly dry and my the rim of the mouthpiece covering my lower lip. As I play, it gets wetter, and the mouthpiece tends to slip about half way up my lower lip. I can play with the mouthpiece in either position. But I find myself thinking it should stay down where it started. I never start playing in the einsetzen position. Is my experience common among brass players? What are Tenor Horn players taught about proper embouchure and mouthpiece position? Thanks!