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

Americans pronounce honeymoon as HUH-nee-moon (/ˈhʌniˌmun/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "The sweet couple booked the honeymoon suite".
Record yourself saying "honeymoon" and play it back. The mic stays on your device — nothing's uploaded.
3 syllables, 7 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
Press your lips together. Air flows through your nose. Vocal cords vibrate.

Round your lips into a tight circle. Let your tongue rest in the middle of your mouth, slightly raised.
Touch the tip or front edge of your tongue to the roof of your mouth behind your teeth. Air flows through your nose.

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 HUH — keep everything else short and quick.