There is a lot of work ahead of these two. For both being novices they aren't too bad. Every one has givin you some great advice.

When stacking the dog in the ring you are presenting the dog. The handler needs to be as invisible as possible. Use as little movement as possible. Pull the collar to the top of the neck and hold it up. You have total control of the body when you have control of the head. Hold the collar up the whole time you are stacking the dog.

Bait should only be used as a reward. Never during stacking. The dog is concentrating on getting the bait instead of stacking. When I am handling I don't even give bait until we are done in the ring. The dog must finish the entire task before being rewarded. I use bait to get ears to stand and get expression.

You can totally eliminate fiddling for bait if you stick it in your mouth. Some bait tastes horrible, but you just have to deal. It's easy access.

I don't know much about shepherd movement. I do know, like everyone else said, that they are moved quick and in front of the handler. Almost looks like they are dragging the handler.

When the judge is going over the dog back away, but keep your hand still holding the head up by the collar. Stay out of the judges way. That's another part of the "invisible handler" thing.

A WONDERFUL book and training and the mind set while showing dogs is The Winning Edge by George Alston. I bought mine from dogwise.com They have a ton of informational books.

Good luck!