Push a stream of air from your throat through your open mouth. No tongue or lip contact.

Americans pronounce heavy as HEH-vee (/ˈhɛvi/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "Somehow, he held the heavy handle high" or "He hid the heavy hammer behind the hedge" — more examples below.
Record yourself saying "heavy" and play it back. The mic stays on your device — nothing's uploaded.
2 syllables, 4 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
Lift your bottom lip so its inner edge (where the wet part meets the dry part) touches the very bottom of your top front teeth. Add vocal cord vibration as you blow air through.

Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.

Click any sentence to see the full breakdown — every link, every reduction, every flap-T.
The textbook way isn't wrong — it's just not how anyone actually says it.
Stress falls on the first syllable, not the others. Stretch HEH — keep everything else short and quick.