* Trust your instincts. Don't be afraid to make mistakes or take risks. The best improvisations come from a place of spontaneity and intuition.
* Listen to your fellow musicians. Pay close attention to what they're playing, and respond to it in your own way. This will help create a cohesive performance.
* Be present in the moment. Don't worry about what's going to happen next. Just focus on the music you're making right now.
* Have fun! Improvisation is a great way to let loose and enjoy yourself. Don't take it too seriously, and just let the music flow.