My advice: Practice going over other people's code with a fine-tooth comb looking for bad architecture, flaws and inefficiencies.
I agree. Funny story, I wasn't allowed to do code reviews at my current job for about 2 years because they thought my comb was too fine. Suddenly software quality is something they are really valuing and they're allowing me to do code reviews again. Funny, that.
It's because all three are part of the Commonwealth.