This - like everything, if you've got people pulling against, sometimes out of an inferiority complex and lack of respect instead of trying to understand, it's going to be an uphill challenge from the start. Out of interest, I always think a project you're going to run using P2 should start by...
You say that, but if common sense prevailed, there'd be no need for a controlling methodology. Having got my P2, and being a cynic beforehand, I learnt a whole new respect for it. People who dismiss, as I did, more than likely just didn't get it probably born out of, dare I say, plain ignorance...