You don't necessarily have to "hide" the actors off screen but instead just make them invisible and visible as needed. Keeping them off to the side and visible works too and it comes down to personal preference.
There are always several ways to do the same thing via different methods.
Keep in mind that you do not have to complete your entire animation in one project. While it can be done it is almost always easier to break up your animation into scenes and have a project per scene. Of course you can copy the last, or any, scenes project to another project for the next scene so that you don't have to "rebuild" the stage each time.
Once all your scenes are exported then use a video editor to assemble your masterpiece, apply sound, music, effects, etc.
I have found that it is easier to get one scene right in a project then trying to get 10 scenes right in a single project.
It also helps having multiple projects in case you have to go back and make a small change in a previous scene. Something I do often since most every time I re-watch a scene I see something else to tweak and improve.
Again, its all personal preference. Pick what process works best for you.
Jeff
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