There is no definitive guidebook on how to pick the right partner, and even if there were, I'm way too dumb to write it.
I'm probably one of the worst actors as far as preparation goes, because I actually don't prepare. I find it easier to read the script and whatever hits me in my stomach, like deep down, I just go with it. And the director kind of molds me whether to go right or left with it.
But one of the things I learned is that when you fight for something you believe in and you tell the truth and you do your best, you can always hold your head up high and no one can take that away from you.