Welcome to Gaia! ::

I'm a sax, and I recommend that you should have done auxillery.

Practice practice practice. Remember to empty your spit, become less coordinate with the fingers, and pretend it's the only thing you've ever played the second you put it together. I learned to play flute after trombone. But when I was learning to play trombone I would learn the intitial music before I learned the instrument, it gave me time to work out the playing kinks and I didn't sound horrible on the music. Learn the notes in the lineup before you do anything else. That's the only way I know how to learn fast.

First, the Tone. while practicing, close your eyes, take a big breath (you played tuba, so this shouldn't be a problem) and set a good tone by a solid F and hold it. Slowly move up and down your range chromatically. It's fun and easy on trombone because all you have to do is move up or down the slide. make sure you are in tune for each note, and have a rich, liquid gold(not molten, cool liquid gold)tone.Next, remember the jazz style. Think two and four, not one and three. If you are playing blues/swing jazz, give beat two and four a slight accent to "swing" the notes. If you are playing Bossa Nova, you will probably play background. If so, keep the beat tight. otherwise, stay nice and relaxed for the melody. If you are playing rock, hell, just roll with it. An awesome trombone chord sounds just like guitar. Remember, Jazz has a relaxed feel, so just remember to keep counting in your head, and mark other
corrections on your chart with a pencil.

Keep practicing. Just by having a good tone you will be better than most others. awesome trombone sounds relaxed and easy, and you'll get to laugh at how silly the other instruments are. PM me if you need more advice.