I agree with Jorgie, use your wrist or elbow as an anchor and make long smooth lines rather than a bunch of tiny lines. And I think it's easier when you draw/ink towards you, so I would suggest you tilt your paper as you go. :} And watch out for wet ink, you don't want to smudge your new, crisply lined drawing!
and with what clock said, different tools handle in different ways. So, maybe you can try different types of pens, technical pens like Microns are disposable, or refillable technical pens like rapidographs (a little pricy! but will last longer than a disposable pen). There are also dip pens (which I prefer) which come in a wiiiiide variety (from diff. nibs to diff. handles!), there are also glass dip pens. Then you've got fountain pens, kind of like a hybrid of a technical and a dip pen, but that's what you have so :}