Here is a link to a real professional juggler.
He has issues with the Chris Bliss video, so don't read the whole rant if you don't want to hear about his issues.
DO click the video link at the top of the page.
Remember that if you have ever tried to juggle 3 of anything, it's a quantum leap to juggle 5, because you have to juggle blind, that is throwing and catching without looking at your hands.
Check it out!
http://www.jasongarfield.com/pennradio.html