Ask HN: How to respond to a job offer you're not sure if you're qualified for?

I'm a 17 year old freshmen computer science student who has a passion for education, and I just so happened to run in to the CEO of a coder bootcamp at a conference a couple of weeks ago. I went to talk to with him the other day just because I wanted to hear more of his views on education, and while I was talking to him he asked me about my availability and pitched an idea to me that he would like me working with them on.

I'd be helping develop an internal educational tool for the bootcamp, he talked about how he could have any developer work on it and it would come out okay, but because he believes we share a similar vision in to the educational world it would be much better to have me help with them.

Now this is a dream job essentially for me, and it was just a year ago that I was actually considering attending a (different) coding bootcamp, with the only stopping factor was my parents unwillingness to financially support me.

While I don't have a written job offer yet, the conversation made in abundantly clear that he would like me to join the team, but I'm afraid what if I don't currently have the skills needed to perform well enough. I'm pretty sure I'd be able to learn everything needed to perform in the position, but it's possible that I won't be ready immediately. Does anyone have any suggestion in how to respond to an opportunity like this?