Step 1: Lock the slide by turning the slide lock ring to the right. Carefully put the slide into the bell section at a 90 degree angle. Tighten the connector nut to hold the two sections together.
Step 2: Carefully twist the mouthpiece to the right into the mouthpiece receiver.
Step 3: Place your left thumb under the bell brace, and your index finger on top of the mouthpiece receiver. Gently wrap your other fingers around the first slide brace.
Step 4: Place your right thumb and first two fingers on the second slide brace.
Step 5: Support the trombone with your left hand only. Unlock the slide. Your right hand and wrist should be relaxed to move the slide comfortably. Hold the trombone as shown above.