Only the front part of the tongue moves rather than the whole tongue. Try to feel completely relaxed at all times. Do not make individual attacks, merely interrupt the airstream. For lip trills, keep the same air stream and roll the tongue forward. When your chops are stiff, blow past the and through the horn, they will vibrate.
Enthusiasm is a virtue, impatience is a liability.
You have the same basic committment as the rhythm section-to keep good time. Blue Mitchell Practice your changes, scales and patterns. Train your ear to hear the changes. Play ear training games with a friend Pace yourself during a solo. Be willing to return to the section when your solo is over.