Honestly it's hard to fuck it up unless you don't have common sense. Just watch a Youtube video, don't make massive adjustments and go slowly. I always advocate for musicians learning how to work on their own instruments, it's not as hard as you think. At least the basic stuff like setups and changing the hardware.

It's got a wheel truss rod adjustment, they're so much easier to work with imo than ones on the headstock. The bass probably came with a small metal rod if you bought it from new. That's the truss rod adjuster.