Great advice. Let me add if I may, just like people looking for a fast way to lose weight, there is no substitution for good old diet and exercise. In the case of horn playing, there is no substitution for good old practice, at least a hour a day and seven days a week. I have had people say to take a day a week off from it, but over the 25 years of playing, I found that playing everyday is best. Not that I follow my own advice all the time.
I was taught many years ago also that if you want to play the high parts, you got to practice the high parts. I know this sounds silly, but I have seen players who think if they "save it for the show", you will have more lip left. I think you all know what I mean, and know people who practiced this.