There are those that say, "get your truss rod adjusted, and then...leave it alone."
As a newbie, I could never look down the neck and really 'see' how straight it was at the time. And, guitar shop guys never helped me over that stumbling block.
After reading numerous how-to's on the web (where else) about setup, and adjusted truss rods, I found a great article. This was posted 9 years ago, and still collects comments. It is that good! See Gene's Imbody's article, here.
You don't need to be an expert, we've got plenty of those walking around. Learn to detect the amount of relief in your bass' neck. Start by clamping your capo on the first fret, then follow the steps...