PRACTICE, PATIENCE AND PERSEVERANCE
These three things are the most important aspects of skateboarding. You can have all the talent in the world, but without the three P's, you are nothing. On the other hand you can be a talentless, uncoordinated goof and as long as you have the three P's you'll make it somewhere. I suppose that this goes for anything really, but for me it applies mostly to skateboarding.
Pukesick would have me add this, hence: you also need balls, the three P's will help you, but if you want to go big (i.e on vert) then you need balls.