"Very well Milena, the first thing you should know about the magic in charge of creating doppelgangers is that it works by creating an exact copy of your soul and your body.
In theory, a very powerful person could be able to create a copy of himself without any inconvenience.
The main problem with doing that is that you would be creating a danger to your very existence, as your clone would feel like the real you.
At that moment, a fight would break out where only one could win. Of course there have been cases where everything is solved without fighting or worrying about the consequences of the acts.
However, that is very difficult for it to happen, unfortunately things are not as simple as they may seem sometimes.
For something like this to happen, many considerations must be taken, especially your own personality, since that is the determining factor in knowing if a doppelganger can be an ally or will become your executioner.