The basic idea is that you are having different personalities. So whatever training you do, it is supposed to shape your personality here, but not have any effect on other personalities.

One thing that helps separate the personalities is having a "trigger". Your trigger is something that triggers the change from whatever you were to your new personality. It can be something you wear, something you say, or whatever.

So before you get too far in training, you might want to decide on a trigger and do the training to make that trigger effective. You can add other triggers later on if you want.