refnrev, the primary thing to remember is that the same player whom the libero replaces is the only one who can return to the court when the libero goes back out. If
L replaces
#7 in RB, only #7 can replace the libero on the court. If
any other player comes in replacing the libero, there is an out of position call (point/loss of rally) followed by an unnecessary delay timeout for the illegal substitution.
If a coach wishes to put in a different player than the one who was replaced by the libero, the original player must return to the court (with the replacement always occurring between the attack line and the end line in front of the team bench) and then the new player can be subbed in using the regular substitution procedure between the center line and the attack line.
The only difference that the NCAA has is that the libero is allowed to serve in one rotation only during a game (they do not have to serve, but if they do, they are restricted to the same spot in the service order throughout that particular game). Currently, in USAV and NFHS, the libero is
NOT allowed to serve.
There is a
Libero PowerPoint presentation that can be downloaded from the Illinois High School Association that is a big help (just remember that it is specific to the State of Illinois and your state may make different decisions concerning the uniform top since the libero is still considered experimental for 2005-06).