Darkness, I will be honest and say that while I have good social skills, my social instincts suck.

I learned to have good social skills doing exactly what you're doing. Googling how to behave in an interview, taking cues from my other co-workers about how familiar to be with them, etc. I've had to work really hard to handle myself in social situations, and I will still tell you that my social anxiety can be really bad in some situations.

I think the key, honestly, is practicing. If you need to role play to practice, do that. Or if you can just set up lots of interviews and do it for the sake of interviewing (and maybe you get a job too, that would be cool) so you can get used to the process and how to handle yourself.

There is no secret. It's just practice and being prepared. I think of every question they could ask and I write out my responses to them. Then I practice saying the responses out loud. Even if it's just to my dog. Another good thing is getting a friend to look at the job description and point out questions they may ask and how you think you are going to answer them. They may have tips for how you could answer certain sensitive questions that won't raise an eyebrow.

Good luck,
Seesaw