How do I Prepare for my First Interview

Alright, so I applied a while back to a level 4 apprenticeship position in User-Centred Design (and while this is a UX subreddit I figured it might still be suitable since the terms are used interchangeably and the differences are subtle) in the NHS. This will be the 6th time I've applied for this kind of thing, and the 5th time out of those where I was given an interview.

"But wait, that means this isn't your first interview!"

While that may be true, it remains my first in-person interview, not just in this industry, but in general. So long story short – I'm nervous.

To put into perspective what I put on the table compared to other applicants, I have BTEC Level 3 Extended Diploma in IT, and two and a half (so far) UX certificates (the kind that promise you you'll find a job at the end (I took these knowing this wouldn't happen)) and absolutely zero experience. To clarify, I have a lot experience in customer service and a little in digital marketing, but none in UX.

So long story short, I'd like to hear your thoughts and advice on how I could come out on top when other applicants might offer more than I can, or worst case on how I can deliver a confident performance and gain valuable experience for next time.

Oh yeah, and the interview panel consists of a Director and a Content Designer. I haven't been told what will be in it or what will happen after.

TL:DR – Give me some thoughts and advice on how I can do well in an interview with little qualifications and even less experience.

Thanks everyone for your much appreciated help!

PS: This is also my first post here, I hope I'm welcome!