Was there not once a skill or feat known as Sleight of Hand?

And if not, which skill would I have that would be similar? Bluff, or Perform?

Or can I just assumed since my character is a trickster, and has quick fingers, he knows it?

I imagine perform would be the most closely suited.
Bluff to me, as a hockey player, makes me think of swinging a sword like you're going to strike position A, but then striking position B. To bluff is to appear to do something, then do something else, loosely.

Sleight of hand is to me, like slipping an ace up your sleeve with nobody noticing, and more of a peformance trick.

But we'll see what the others have to say, I suppose.

It does depend upon the action you intend to do with your sleight of hand and could be a mix of perform, stealth and bluff. Juggling would fall under perform only, while 'magic' tricks would be a mix of perform and bluff. Stealth comes into play when trying to keep one's hand unseen such as when pickpocketing.