I made this video a week or so ago. I wish I'd thought to visit this section first, as I am sure there are things in the stickies at the top that I could have integrated into it. But anyhow, here it is, hopefully with the visual stuff added this is helpful to use yourself or to link to a friend/student who starts asking questions about buying a horn. Also it was one of my first ever edited videos (typically I just do one long unscripted take, this was from a script and I tried my hand at simple editing) and I screwed up the very first cut, by forgetting to take off the first few seconds! But I've got crap internet and I'm too lazy to re-upload it. So enjoy a few moments of awkwardness before the video starts.
I also copied the script here in case you'd like to read it as well, but I ad-libbed a few things in the video that aren't in the script so watch the video if you can.