Step 10: Ink the nib - do not dip
It's a "dip pen" - but, DO NOT DIP IT! Dipping will overload it and blots will go everywhere.
You should ink it from the back side only using some kind of applicator.
Here I am using an eyedropper out of a bottle of cheap india ink. Ink up the cavity with lots of ink, but don't go overboard.