I dunno. I used to BE the "proper set up guy" in town, and I can't really understand why people paid me to do what they could do themselves. I think it's important for any bassist to understand and know how to do set up work themselves. There are two main reasons for this view. One is that only YOU know what feels right for you. The best I can do for you is get it pretty close, but to really have your action dialed in, you have to play it and tweak it. It's also expensive to pay me to do things to your bass, only for you to discover that you don't like 'em that way, so you need it done again.
Now, there are a couple of things I wouldn't recommend if you don't have the experience working on instruments. For the first proper set-up take it to a good set up tech (I hate the term "luthier" for people who don't build instruments, and bolting a neck and hardware on a chunk of wood isn't "building" in my book") with experience in basses. You want them to make sure the frets are level and crowned correctly, that the nut is cut properly. Almost no mass production instrument in my 30+ year history has had the nut cut acceptably- exceptions being Takamine acoustics, Guilds (at least the Rhode Island ones, I haven't seen many Corona ones, and no Tacoma nor Connecticut ones), Laklands (both US and Skyline) most Ovations and Hamers. Also make sure the neck is stable with no twists, and the truss rod works evenly across its effective range. If those things are in place, then any bassist who can figure out how to play a gig without killing either the drummer or the guitarist is smart enough to learn how to do their own set up work.
See, a lot of set up stuff is about trade-offs, not absolutes. There isn't a "correct" amount of relief, action height, etc. And most people need to play with the difference between a flat neck/higher action and slight relief/lower action to determine which they prefer.
Second reason for knowing this stuff on your own is that it gives you a much better understanding of the differences between a good instrument and a great one. At some point, the limits of set up are determined by the bass. And understanding these things allow you to play something, look it over, and determine whether what you don't like is an issue of set-up or an issue of construction. I've seen too many people pass up a great bass because it wasn't set up the way they like, and I've seen too many people trying to turn a pig's ear into a silk purse when the wood and hardware just wasn't ever going to be a great instrument. And that's across all price levels.
So, my advice is to do this.
A. Buy a copy of Dan Erlewine's "Complete Guitar Repair", and augment that with the great on-line set-up instructions available (there's a much better one than Willis' out there, but I don't recall the author's name).
B. Lock your basses up in the cases, sit down with the book and read through it. Pay special attention to when Dan talks about trade-offs. Just read through it, study the illustrations (great book because he uses a combination of photos, line drawings, and charts- whichever conveys the knowledge most effectively).
C. Repeat this process with your bass in your hands, but no tools. You just want to see how things go together, what your options are, how the specific hardware on YOUR bass matches to the examples.
D. Then get some GOOD tools- don't buy your screwdrivers at the drug store, get some decent ones. There's a list in the book, but at a minimum you'll need screwdrivers, a 6" metal machinist's ruler, some allen keys/hex wrenches (SAE and metric)- go for the smaller sizes, a good tuner, and some patience. All except the patience are available at "home improvement" stores, real hardware stores, and Sears.
E. Now and only now, go through the process of doing some set-up. Don't do everything all at once, and make small adjustments. See what happens if you make the neck perfectly straight and adjust the action so you can play without buzzing. You like that, or do you prefer it with a little bit of relief? Write down what you do, like "turned truss rod 1/4 turn CW" so if you DON'T like what you did, you can get back to square one.
Enjoy your new-found relationship with your bass!
John