A point of reference: anyone who uses language is automatically being "logical."
It's really just a matter of whether the logic is covert or overt.
See, to speak and be understood, everyone makes connections between meaningful utterances: this sentence follows that, this response suits that statement, my tone expresses this meaning, and so on.
The "logic" is overt if you actually say your meaning, completely and directly. As in, "We're here today to discuss existentialism, so let's groove like Socrates with a joint to share." The logic is covert if you have a purpose to your utterances other than the openly stated purpose for meeting and speaking. As in, "I think Obama is great for the future of our country," he says, pocketing his Republican Party membership badge and eyeing the sweet bi-racial chick sitting in the back row.
Everyone uses logic. It's just, a lot of times, they don't lay the whole of their purpose out in the open for everyone to pick over, and therefore they tend not to codify their logic, nor to test it directly, nor to even make it directly available to themselves.
People, I say, and Freaks. The difference is in the toe-nail polish.
But anyway, Critical Thinking, that's what it's called. They even call it that in business. There are courses out there, wholly focused on the business utility of thinkin' critical.
"Being more logical" is practiced more or less just by spelling out in suitable detail why you did something, or should do something, and how it relates to other things. If you do it often enough, the style of talking will transfer to other subjects.
It's hard. But, as they say in the movies, if you do it with a friend you trust, then it's rewarding.
Oh, and by the way, for learning and teaching logical thinking an ENFP teacher I know swears up and down that:
Edward de Bono is a god
and his CoRT techniques genuinely work.