Don't worry, Jerry ;). Lots of people will understand it .... in the UK, at least. 'Hey presto!' is an exclamation taken from a magician's or conjurer's act. Just before the rabbit jumps out of the hat or the lady disappears in a puff of smoke, the magician says 'Hey presto!'. You can say it to signal a sudden and surprising appearance, disappearance or sudden dramatic change.

I guess you could use it any way you want but no one will have any clue what you mean.