Hi julopez, (capital or small j?)
You can download the clip and move as slow as possible through it. Typically the arrow keys should work to go step by step.
This following is, of course, only needed if you want to move each object independently.
I move the object away from the X, Y, Z, CenterPoint (world origin, 0, 0, 0 coordinates).
Dependent on that movement, the Symmetry object will need to be set up: Mirror Plane. Simplified, if you move it along the X-axis, then it is Z and Y. if it y, then X and Z, or if it is Y, then Z and X.
Then I made a copy of it, switched the original group off.*
Made the Symmetry Object editable with the key-stroke c.
What we want here is the show that was produced newly with the Symmetry tool. So we need to select the shoe that was there before the Symmetry was created. In point mode, we select and delete.
If that worked well, the initial Symmetry is not needed and can be switched off.
Now you have two models, a left and a right shoe.
*As a side note, starting out with the Symmetry and copy that has one advantage, you can just copy the original group if things don’t work.
If you copy the model first and then use the Symmetry, you need to set up a new Symmetry+Object if you are not happy with the result. Either way is fine.
Start with a simple model first.
All the best