I just stop feeling emotions... my mind can easily come up all these ways in which I could manipulate those around me, however I just keep telling myself not to; my (strange as it may sound) atheistic faith is enough to hold me. Then I work on feeling emotions again, and after a little while I'm better. I'm very proud to say I've not attempted manipulation of ANY sort for years.
Gets difficult sometimes though; it is so very easy to gain practically anything, if you are willing to work on it and don't care about what happens to other people... but now I've built caring for others into my entire belief system. These days I rarely feel like becoming uncaring... it's a much nicer world.