Lift your bottom lip to touch the very bottom of your top front teeth. Blow air through this contact point without voicing.

Americans pronounce ferry as FEH-ree (/ˈfɛri/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "The ferry crosses the river every hour on the hour".
Record yourself saying "ferry" 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.
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 FEH — keep everything else short and quick.