Please do use this. Tooltip tutorials are a user experience heaven. If you don't feel the urge to add this to your site - think again.

User interfaces are getting better - which means if your UI is good, it is different, thus it won't be intuitive to those who are trained to not expect it.

Often one has to choose to design a UI for the daily use vs. first a time usage. Better to put the clatter in the tooltips than to let them always be in your users way.