teletail
Friend of Leo's
There are no tricks, secrets or short cuts; only practice. Reading is the skill it takes the longest time to master, the shortest time to lose.
Also: a spare jack cable, a few cloth pins if playing outdoors, a stand lightXerox all your charts. Use colored markers to label repeats and Codas and stuff so you can see it easier. Tape your pages together so they fold open to eliminate page turns. The D.S. is almost always on a different page.
If you can't hear yourself, you are playing the wrong chord or lost your place. Use chords on the top 5 or 4 strings only to not step on the bass player.
For trombone features and ballads, stick to half notes.
Remember: professional is a behavior, not a status.