Hi Di,
What worked with Emily was a combination of things: When Emily would pull hair or pull hats off, all children in day care would stand up, put their hand up, say stop and walk away. Emily also had story books which showed it made children sad when she would pull their hair and hats off and I noticed that when I explained that she had to be nice to babies, it worked. Distracting and just doing something else is the most difficult one, but it takes away the attention given, so there is no point doing it anymore. I know.......it's all easier said than done.