If there is one thing I know, it is that I would be hated by this forum.
1 - I would be in the game to win. My gameplan would be to make sure that I did not piss off any of the housemates, and I would make sure to conceal my dislike for any of the housemates. I would trust nobody. Everyone is waiting for a chance to stab you in the back.
2 - I would tell the truth in the diary room. (ie. Person X is a w***er, or Person Y is a great guy) Outside the diary room, everybody thinks I get on with everyone else. I would not try and influence anybody elses opinion, unless I felt that matters had got out of hand.
3 - I would not let this "mask" slip under any circumstances, throughout the whole experience. Since I rarely drink, this would be fairly easy in my opinion.
Some more of the reasons why I would be hated:
I am from a well-off middle class background, which never goes down well with the British public, who for some reason would rather see working class guys win.
I am well educated, and have little patience with stupid people, so that would piss off people who would think I am an elitist snob.
As mentioned earlier, I don't drink much, so there would be no chance of me creating a scene while drunk.
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If I got evicted (And I would expect to be evicted as soon as the public got the chance to vote for me), I would expect to be booed out the house, and might be a little disappointed if that did not happen.