I had my first lesson with a trumpet instructor. This one truth became immediately clear:
While I thought it would be a good idea to learn the basics such as the C Major scale prior to getting lessons, this is not the case. In fact, I only hindered my development so that now, I not only need to learn HOW to play correctly, I need to UNLEARN how to play incorrectly.
Trumpet is not like any other instrument I have learned to play proficiently (and I have learned to play several instruments proficiently). For all those like me who think they can just teach themselves, please believe me when I say that you are only doing yourself a disservice by not getting proper instruction.
The good news is, I've only been "self teaching" for a week, so it's not the end of the world. However, this is the first instrument that I find it absolutely necessary to have a qualified instructor from day one.