I’m a relative novice but here’s my 2 cents.

Go into it with all your love and acceptance and let whatever happens happen. They make you feel goofy and fun loving and ofc the visuals can be a blast, but they can also blow up any bad emotions, upset your stomach, and sometimes the experience can be pretty intense. Any bad stuff is usually cured with a lot of love and acceptance, both from the traveler and anyone there with them.

I’ve had bad trips before on shrooms but even those I didn’t really feel like I needed a sitter, I was just immobile on the couch riding waves lol. Having someone there to tell me I’ll make it through would’ve been nice but nothing serious was going to happen either way. I knew I was going to be okay, these are just about the safest drug you can do, so self assurance came naturally with knowledge about shrooms. I’ve never done acid, but anecdotally it sounds like bad acid trips are way more volatile and difficult to handle. My take from bad shroom trips usually ends up being “yeah that was a bad trip but I’m still glad I did it, I feel better than I did before”

That being said, most trips are fun and joyful for me. Hopefully that’s the experience your boyfriend has too. Have fun!