I agree discourse is non trivial to set up, and it’s the first large project I’ve interacted with that’s written in ruby / rails.
The only actually difficult issues, however we’re with first getting outgoing emails setup, the suggested email providers won’t even talk to someone running a small volume. There was an additional day invested in setting up incoming emails, which many of our user base insist on .. everywhere you find people who don’t care to interact with a new service 
.
We also bricked our install, somewhere between me trying to do something I didn’t realize was impossible (nesting more than 2 levels of categories), then trying to delete what I’d done … simultaneously to a dev I’d shared root privileges with breaking some things trying to run another site alongside on the same host. .. had to reinstall and recreate all categories.
Completely worth it