I have a long involved horror story that led up to me needing a root canal that I decided not to post here because it probably isnt nteresting to anybody but me.

For the most part, a root canal is kind of minor. They numb your gums where they're going to inject a numbing agent, then they inject a numbing agent, worst case they go a little nutso and try to inject a few places in there but the pain is there and gone in 5 seconds. If at any point you feel pain they can do a better job of numbing you. Honestly, any pain caused in the numbing process goes away pretty quickly when they successfully do it.

They poke around, there's a little drilling, some bad smell maybe heat maybe cold a lot of spitting out little sandy chunks of debris. If the tooth is still in pretty good shape they just pack it back up and you're good to go.

If you end up needing a crown there's a good bit more drilling a good bit more spitting a good bit more smoke. But it's really just the same thing prolonged.

It won't kill you, it will annoy you and it's marginally unpleasant, The anxiety of being there in the anxiety of not knowing what's going on is much worse than the actual procedure. Meditate, chill, roll with it you'll be fine.