I was just playing with the construction set and I noticed under miscellaneous/animobjects/idleobjects there was an item named "SE09RelmynaWriteBook".
How could I use that to make one of my npc's write?
Also, I saw someone juggling in Bliss and I was wondering how to make my NPC's juggle.
I'm assuming dancing works similarly.

I appreciate the help. =)

Idle Manager -> to assign the animation.
Anim Objects -> to assign the Anim Object to be attached to actors playing the assigned animation.

overall its fairly straight forward and easy to understand once you start messing with the systems.

I'm starting to understand a little bit.
When is throwing me off is it asks me to select a .kf file from the folder.
How do I use one from the game?
I tried typing "characters\_male\IdleAnims\SETakeNotes.kf" in the box, but it said it was incorrect.
Is there some trick to this I'm missing?

Always look at the Wiki first: http://cs.elderscrolls.com/constwiki/index.php/Anim_Object. There are also alot of good tuts how to start. So you get the base understanding.

As for your question: you can't just type something in what is not in your folder structure. It will be checked.
Either extract what you need from the bsa file (in this case Data\DLCShiveringIsles - Meshes.bsa), using a tool like bsacmd. Or, better, use an existing entry in the cs and copy it by simply giving it a new ID.