I have a love hate relationship with using art products as the company suggests. I usually start off just doing my own thing and then months later I read the directions. This is not always a safe thing to do, so let me go on record saying...don't listen to everything I say. In the case of permanent or even waterproof ink, we are not talking about too much "danger" here. But what we does happen with ink is that people get a little nervous about how to use ink products "correctly". I urge you to simply experiment with "drawing" with the tip of the bottle, dipping a brush into the bottle, loading a pen, using homemade brushes, etc. With practice you lose your "ink anxiety".
Drawing with permanent ink, especially black ink seems so scary for many people, cause it seems so , well you know....permanent! The fear is that it might smudge, flow too heavy, take a wrong turn when applied etc. And those are all the reasons, I like "drawing with black ink" and adding ink to my Mixed Media collages. I find the process of "playing" with ink liberating. There are many ways to apply ink, sometimes I go for broke, and just pour the ink or black paint right on the paper holding the bottle up high and letting the ink land on the paper. Oh yes sometimes "accidents" happen, and that is what usually makes my pieces special.