You will probably be able to sense right away if someone is deliberately angling their body away from you, even if you don't consciously process that thought. People tend to sit angled towards and even leaning towards, people they like. This may not happen when you first meet someone, as they may wait a little while to gauge what you are like, but if they start to position themselves in your direction and lean in closer to you, then the chances are that they are beginning to like you.
