Cloning of an element (or actor). Can be hard.
You need to determine the way that you can represent multiple versions. The easiest approach is to allocate a performance space with boundaries that each iteration (of performer) will not cross. Record the multiples then bring them back to blender and perform a crop of each one so they remain in ‘their’ space but all performing at the same time.
Be aware that cross overs include shadows and hard set interaction, this might be bumping into bushes or chairs etc. The hard set must remain unaltered by each iteration unless you have a planned exchange.
Here’s a video i made that demonstrates these techniques:
You don’t have to add the camera wobble.
Another way is to shoot multiple performances of yourself against a green screen. Then replace the greenscreen with your background. But this removes the possibility of interacting with hard set (not easily at least). The benefit here is using a traveling matte, that is the cutout shape follows your performance exactly allowing to to cross those boundaries in front of other performances.
Trying to have the best of both worlds you could create a key from the existing background plate, but it is very hard. You would shoot the performance(s) against an unchanging hard set, then strike the talent and shoot a lock off of the set. Take the lock off and subtract it from the performance version to create a travelling matte (of the performance). This aproach tends to get a lot of contamination from similar colors in the background and foreground.