<human>: Can you provide a brief rundown of the text in within 3 sentences?

Hey,

So I just met my boyfriend's sister (SIL for simplicity) last weekend. Even though I've only seen her two times we're all happy that we all get on great, so I'm really stoked about it.

I'm a graphic designer and she just messaged me asking me to show her / teach her graphic design. I can't think of any simple way of showing her such a huge and diverse field (do I show her the software, or the rules of design? etc), there's so much to know about it and honestly it would be really boring for me and not really an efficient use of either of our time.

I don't want to be rude to her, but I can't even imagine how I would begin to show her something this big.

How do I say "no" in a way that won't be too harsh?
<bot>: SIL wants me to teach her graphic design. That's impossible to do without sitting down for hours. How can I say no?