Another tool to achieve likeability is to consistently project positive emotions and create the perception that you are happy and enjoying the interaction. The quickest way to make someone like you is to create the perception that you like them because they make you happy - this is of course much easier if you genuinely do enjoy social interactions.

he or she feels comfortable and happy on a moment-by-moment basis

It is very good advice to care about other people.

I'd like to add that I think it is common for the insecure to do this strategy in the wrong way. "Showing off" by is a failure mode, but "people pleaser' can be a failure mode as well - it's important that making others happy doesn't come off as a transaction in exchange for acceptance.

"Look how awesome I am and accept me" vs "Please accept me, I'll make you happy" vs "I accept you, you make me happy".