The trombone is obviously not an ideal introduction to the brass family as a whole, fogie, as it's the one that's different. It does however have its moments.

The real reason I gave up on it was that my eyesight changed after some ops, and on the rare occasions when I got the music where I could see it through my fiendishly inefficient bifocals, I was inclined to swipe it off its stand every time I went for a "C" (or a "D" in transposing mode).

Once equipped with Otto Langey, many years ago, I never looked for another tutor. There IS a Tune a Day book, but it's worth casting around to see if you can find someone with a copy of OL that's giving them nightmares. (It may even be still in print for all I know.) Work through that from beginning to end and you'd be a fine player, but obviously you'd go at your own pace. I got about halfway, over 15 years or so.