If you got the interview through a network, you're already way ahead all the other candidates. And if you're otherwise a competent candidate, they're probably mostly seeing if they like you as a person. Good luck!

I emailed my interviewer and said that this was my first interview in the field and asked what I could expect from the interview and what to prepare ahead of time.

I made me a lot calmer and more confident knowing what to expect.

I got the job.

YMMV.

"I'm familiar with X, even though I've never done it myself. As this is my first job, I'm confident I will learn quickly."

Repeat this phrase when needed (change it up a little bit each time so you don't just repeat yourself)

If you’re offered hospitality (like coffee, water, whatever) accept it even if you don’t really want it. Little things like that leave a good impression on people.

You're interviewing them as much as they're interviewing you. It reflects poorly on you if you don't ask questions. Because it shows that you haven't actually thought about how you plan to fulfill your job expectations.

Advice: do some research on the company, know what they do, know what you'll probably do if you get hired. Then come up with questions - things that aren't obvious through your research. For instance, ask them to talk about work culture, management style, expectations of your performance, etc. The exact questions will depend on the specifics of the job. But in other words, put some careful thought into envisioning the day-to-day activities of the company and how you foresee yourself fitting within that structural framework.

Second advice: search up common interview questions, and prepare an answer to them. It'll be shame if you get tripped up on easy questions. For instance, you should know how to respond if they ask you why you want this job.

When shaking their hand, a little tongue will go a long way to show them that you're a team player. /j

Relax, deep breath, and take your time answering questions.

Good luck!

I'd say good luck. But if you're looking for advice, likeability is more important than skills. Don't be afraid to go off topic

Try to look friendly, give positive or optimistic opinions (badmouthing is a red flag), try to perhaps know some basic things about the company, like what it produces.

If they want more than 2 interviews, it's probably shit to work there.

Be yourself, show that you're a happy and good person to be with. They may not hire you for your experience, but they definitely want someone that they will enjoy to work with.

Bring a few molotov cocktails with you to negotiate a better salary.