best suggestion
Make a learningWorld folder put all your test areas in it.
For scripts put Learn_<script name>
if you want to make a change to a E or he script should be making a copy of it anyways, just incase.
Do the same for fields, enums, etc.
Then if you want you can remove all Learn_scripts from the game if you need to later on. Or replace them bit by bit.
It's usually what I do, make a Learn_ work out all the stuff I don't know, then make a clean version with my games name prefex.
Then you know learns are jsut practice, and your game name ones are the real go live stuff.
The areas you can pretend to delete from organizer / repository if you wish, but they will still be there. When you go to migrate to your live game server you can get some clean up done so don't worry about that piece.