Bending takes a bit of practice but it’s not terribly hard. Here are some general tips for absolute beginners that are based simply on my anecdotal experience as an amateur player:
1. Don’t start with a wooden harp like marine band. The metal and plastic ones are typically a bit easier to bend.
2. One hole at a time. Ensure you can exclusively blow in a single hole to practice
3. Lower notes are generally easier to bend than higher notes
4. Make an O with your mouth and have the tongue float in the middle. Start by pulling, not pushing, in my experience bending on intake is slightly easier than bending on blowing out.
5. Tighten the lips and decrease the size of the O to increase pull force on the reed to create a bending effect, and also tighten the airflow chamber above your tongue by pulling your tongue back and up, then loosen it by moving your tongue forward and down
This tool looks great for helping improve once you’ve been able to perform the initial bend. Excited to try it out!