I just did my own simple setup and it made an big difference.
My bass was set up pretty well when I got it but the action was kind of bugging me - it felt like it was taking too much force to play. Especially the D and G strings, but also the A string. E string seemed fine.
I checked the truss rod tension and it seemed fine - I didn’t use a gauge but fretting the first fret and a fret up by the neck/body join, there was a nice and small gap between the string and the frets all along the neck - a couple pieces of paper thick or so, and it looked relatively even. Close enough that I don’t think I could have improved on it for my first self-setup, so I left it as is.
Next, I started lowering the action on each string a quarter turn at a time, until it felt “right”. It might actually still be a bit high - there isn’t any buzzing even if I pluck reasonably hard. A couple of the strings came down quite a ways, maybe a full turn for one of them, 1/2-3/4 a turn for the others. E string didn’t need anything.
The difference is huge. It just feels so much better. Surprisingly, it sounds better too - I am guessing because the strings are now closer to the pickups? Anyway, big improvement and much easier than I had thought it would be.
I found a pretty good video explaining the process but it wasn’t hard - just searching youtube turned up a bunch. The Yamaha manual actually has very good instructions as well, including spec measurements (which I didn’t use, but it’s nice to have.)
I didn’t even try to adjust intonation though. I suspect my tuner is not up to that.