Lemme pose a couple of questions to answer yours, detroit_red.
What kind of player needs to practice at home like hell, before showing off a solo thats played in ONE chord/progression? In this case, Vai, soloed in Bm, and only Bm.
How much do you think someone needs to practice like hell before they can pull something off like what Vai did (Crazy solo video again) in front of a live audience?
I'm sure this would help...