How to switch personalities?

I'm trying to conduct an "experiment". I want to be able to switch my personality on demand for this. I want to be able to go from an extremely lazy person to the most motivated and cheerful person in the world. I'm trying to see how people react to these different personality traits, there will be eight of them in all including my regular self as I guess a constant. Each personality will have it's own interests and maybe they will cross over each other because they can't be completely different. I may not ben able to think of eight completely different people. It will be sort of like having multiple personality disorder but I am in control of it all. I want to see if I can do it. This will also help me in writing. This way I can step into my characters. Any advice on switching into my characters throughout the day and being able to stay in character and making people believe I am a "real" person and that it isn't all fake? Also I would like to see which personalities I should try and become. I'm sure my personality will change into these different masks over the course of this experiment so I am trying my best to know who I am before hand so I can ensure that I am not completely different and confused at the end. Thank you and I hope you understand. If not ask for me to clarify. I just thought of this last night so I don't have everything worked out yet.