I had the same copy paste problem, now I use jjui (https://github.com/idursun/jjui). The daily operations become even smoother, it looks like I’m flying over the log.
This is The Way. jjui makes jj's power and simplicity even more powerful, simple and beautiful
I'm in a very similar situation: been using git for a long time, but anything more complicated always via some kind of UI (often intellij).
Been using jj without significant issues for about a month and been super happy to be comfortable using the cli and slowly ramping up to more complicated operations.
The documentation still assumes a lot of inherent knowledge which sometimes makes it a little difficult. I love seeing blog posts like these and hopefully some more in depth resources will appear over time. Steve's guide is good, but there are still gaps for me :).
Next I want to learn some more revset language and become a bit more fluent with rebase operations. I love the more simplified cli, conflict resolution and op log!
The thing I'm running into right now is that I should really learn the revset language, so that I don't have to constantly copy paste ids from jj log