I agree with Dr. Dave that technique is by far the most important part of jumping a ball, but just be aware that some equipment will make it a real challenge.
I'm good enough at jumping that I'm usually more concerned about my aim than whether I'm going to clear the obstructing ball, but there's a huge difference between jumping with my jump cue, my break cue, and my playing cue.
I even remember a time when someone handed me a new jump/break that they bought and I couldn't jump any better with it (broken down) than I could with my playing cue. The tip was soft and the taper wasn't very rigid, so I was doing good to clear half a ball with that one.
Most of the people I've taught to jump struggle with it for a little bit, but once it clicks and you get a feel for what it's like to get the CB airborne a few times, it's pretty easy to do it consistently with just a little practice.