An old favorite about expertise from youtube, yoy-ing:

Stronger yoyo (http://www.youtube.com/watch?v=CSm0VgGwBSo)

It’s supposed to take 10,000 hours to develop “real” expertise, but the kid above doesn’t seem like he’s been alive long enough.  Or maybe he’s not actually a real expert, my friend who used to juggle professionally says yo-yo tricks aren’t really that hard.  He pointed this out to me, though:

Diablo juggling (http://www.youtube.com/watch?v=LZTfy3Oe2b4)

Which appears to reflect fairly extraordinary skill at a certain kind of juggling.  What he’s doing is even harder than it looks.  My friend tried to teach me to use the Diablo recently and it’s hard just to get it spinning in the first place.

These are good basal ganglia expertise/practice demonstrations, though.  There’s no way that an explicit explanation of what to do is going to let you do any of these tricks.