I've been running 1-on-1s for a while now. They're not hard to do, but they're easy to do badly.
The specific thing that bothered me was always the notes. I'd have last week's notes somewhere — a Notion page, a text file, a doc — and I'd be trying to reference them while also writing new ones and actually paying attention to the person in front of me. Three things at once, none of them done well.
You have a number in one range and need it in another. A slider reads 0 to 100, but your audio gain wants -60dB to 0dB. Same value, different scale. That's remapping. Some engines ship it, some don't — either way it's worth understanding the math so you can write it yourself when you need to.