If you mean shadow work as in meeting the hidden aspects of yourself, there are many ways to go about this. Many of them revolve around introspection, meditation, and the like.
Carl Jung is an excellent source of information about shadow work, as well as derivative works based on his teachings on the matter. At the least, using his Active Imagination techniques is among the lists of ways to encounter aspects of the self.
Basically, the easiest ways to begin shadow work is self-analysis, in terms of keeping a close track of emotional reactions about other people, noting things which cause a stir -- to overly simplify it.
Taking on different personality traits can be part of more in-depth methods, but it must be done with the right purpose in mind: Taking on the perceived personality of another, in order to examine that person's personality traits in one's own life.
There may be some easy ways to get started, but there really is no easy way to in-depth shadow work. It is a very thorough analytical process to examine the emotional self.