I am playing "One Mint Julep" in my jazz band (trombone 4 part). I have a G3 note with a short lip trill. I usually see lip trills on higher notes, so what is a proficient way to play these? My band instructor said to just move my slide from 4th to 3rd position very quickly, but was wondering if there were any ways I can do a lip trill normally?
Playing the G in 6th position with the F-trigger might give you an easier lip trill.
If that doesn't work and you don't want to use the 3rd position G, then you have to find a way to fake it. Your band director's suggestion sounds like a good way to do that. Or maybe you can get away with just leaving the trill out.