I'm going to ballbust my friend and I need some advice

So I (35F) know this young man (19M) from work, we both work the nightshift at a small gas station in the middle of nowhere and we've become pretty close, he has a thing for older women and I have a thing for younger men and lately our conversations have been getting more and more intimate. We've been wanting to meet up outside of work for a while to hang out and maybe get a bit intimate and yesterday we where talking about fetishes and he admitted he was into ballbusting, he asked me if I would like to try it out and I agreed we could meet at my place on Monday(tomorrow) and that I'd be willing to try it out

After some research I think I have a pretty good grasp on what this fetish is but there are many things I'm not sure about.

If I'm honest I dont know what to feel right now, I'm really really anxious, scared and definitely a little exited, it sounds like this could be fun, I'm not into it sexually but I do like the Idea of having a guy totally at my mercy but I am really worried about going to far or maybe doing everything wrong

Long story short what I'm here to ask is how to I crush his nuts in a sexy way? From what I understand this seems very painful and I'm not sure how I can cause him pain in a sexy manner

I'm also not sure what I should do, it's been a really long time since I've hit a guy down there and I'd like to hear if you guys have any suggestions

Also last thing, I've read that verbal ballbusting can be a huge part of the experience and I was wondering if there is anything I should text him tonight or what things I should say tomorrow

Any advice you can give would be greatly appreciated

Edit: thank you so much for the replies, I'm definitely less anxious and really excited to try this out, I think this is gonna be really fun