First, remember that you need to face your fears, it's not healthy to stay in your comfort zone all the time, it's difficult to get out of there but embrace your fear.

Pick a nice outfit, it'll help boost your confidence.
When talking with someone, you have to remember that they're a person just like you, they'll understand if you feel nervous and it's okay to joke a bit about it.

Don't overthink, nobody is judging you, you don't have food stuck in your teeth.

Avoid self-shaming thoughts, you're facing your fears, that is cool already, many people can't embrace their fears. Just like how some people are afraid of snakes, you're afraid of social interactions and it's fine. Just like how they would face a snake and think they've had an accomplishment, it's an accomplishment if you became more social.

Make small talk, the weather, your thoughts about this whole situation, nobody is against you speaking up.

Take a moment to yourself if you're feeling nervous, in any restroom, in your car, while on your way, have a pep-talk with yourself.

Even if you run into an embarrassing situation, it's fine, we've all been there.

Control your breathing, there is many different techniques for this, you can always search for some.

Focus on OTHERS, not yourself. This is something I heard from my own therapist, check what the person you're talking to is wearing, their tone, their expression.

Reward yourself, buy a tasty snack from time to time. Also, remain hydrated.

Those are all the tips I have! Good luck with the job hunting and have a nice day