This advice is still just fine. Those who make it to the end, are pretty fine players. As a conservatory method, Arban was designed for professional guidance, not so much self help Actually, those really in the know do not challenge the basic concepts. Granted, there were not very many lead trumpet players in 1850, but even today, my experience is that more lead players are born rather than made....... Actually, there are two camps: silver bullet and hard work. Both camps have their success stories, but the second one has more consistent results AND is not very metaphysical. Good for you! Even if a day ends not so good, that does not mean that there is nothing that we can carry into the next. The important part is that we identify what we can change, what we can't and then go do the right thing. Character counts, so even major setbacks do not need to comprimise our very being. Maintaining character even when times are not so good often makes us a beacon - for others as well as ourselves. When I am emotionally wasted, my trumpet always gets me back to a better state.