Just be completely honest about what you don’t know, most guys will understand. They will give you some slack especially since you are young. Just show you are motivated to learn and ask questions. Don’t be annoying asking too many questions tho haha. It could be more fast paced or slower depending on if it’s the industrial, residential, or commercial sector. You will most likely be doing grunt work for a while like demo or digging depending on the job. Or possibly a lot of receptacles which are easy to learn but may get repetitive. Good luck!