It's hard to answer this without knowing you personally, but with regards to the negative words you have to give about yourself - why not make them positive negatives.
What I mean is, don't go in there saying, for example, lazy, messy etc, etc. But try to make them good negative things, like, talkative or chatty (to some this would be a negative, but i guess in the PR game this would be an attribute!). It's hard to give examples but do you get the idea?! It could be a negative like, you always say yes to overtime (obviously not good for social life, seeing a partner etc, but definitely works in the company's favour!)
Hope that helps!? Good luck!!