Actually, first step to being a good liar is being honest. If you convince people you are a bad liar, they'll just see you as a liar.
If you convince people you are a trustworthy, honest individual, you could kill someone in front of them and they would still believe you didn't do it.
Source: been lying and bullshitting my way through life. The trick is to lie as little as possible and believe in your lies. That's the most important, self confidence.
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You get to choose a skill at which you will be best at. But instead of you getting better, everyone else just gets worse. What skill do you choose?