Step 5: Rinse and repeat...
Continue moving the item in question or adding on the new thing as you go along, remember to duplicate the newest layer after each change.
When you get the desired effect you have a choice, would you like the image to jump back to the original or reverse itself before repeating.
If you want it to reverse make a copy of the layers and order them the opposite direction from the top of the newest, so:
Newest (last frame)
If you only want it to jump back you can just skip that bit.