That's a very good advice, and no, I do not have a teacher... Hum, no, I've got one, Mr John Healy. Sure I'm still a beginner, playing the cornet is difficult but I appreciate it. Well, I don't work hard, I work it. Working hard as a beginner is dangerous for the lips, bad habits come like this, that's the thing I learnt with my experience. Patience and work, that's your advice, I agree. Thank you, all of you, for your answers.