I keep reading advice to put the right thumb between the first and second valve casing. I have never done this and it feels really weird to me. I have always tucked it just in front of the first valve under the lead pipe. Is my way wrong? If so, why? Is it because my right thumb is taking some of the weight of the trumpet? The other way feels so awkward and cramped to me. Does it make a difference that I'm really small with almost kid-sized hands? I can't even reach the mute to do quick mute changes while playing unless I'm on a cornet.