I finally got around to setting up my new bass last night. It took a couple of days to get the necessary tools delivered, and then a couple more days to quarantine them once they arrived.
The truss rod adjusting was nowhere near as scary as I had originally thought. My Jazz Bass is a '61 reissue, so it took a long time to get it just right. Take the neck off, adjust, neck back on, tune to pitch, wait a bit, measure, take the neck off, adjust and so on, but I got there. I was able to lower the action to the point that, I can play each note clearly and without buzz when playing gently, but if I dig in I can get that 'growly' tone. The pickup height, intonation and nut height were all good out of the box which was a nice surprise.
Thank you all for your advise, it was well received and helpful. I now have a bass that sings.