Wow, guess I haven't been here in a while and totally missed a great blueberry thread!
I also grow Southern Highbush berries in SoCal. I 'only' have about 60, all in the front yard in pots. I'm currently involved in the massive task of repotting, root pruning and even dividing of my plants. It is very difficult to get the really good varieties here in California but a good number of years ago I got most of my plants via a group buy through a 'Rare fruit and nut club' in Los Angeles that I saw mention of on Garden Web and successfully tracked them down. I don't think that exists anymore as the grower kept raising the bar. 'They' really don't seem to want homeowners to have access to the newer varieties, although last locally I've seen Emerald and Jewel (two of the better really low chill ones for my area) for sale, as well as the out-dated Misty and Sharpeblue.
I can't add much to what's already been said. As mentioned, I grow mine in pots, and once you have a successful formula down, you don't have to change much. I also use battery acid as an acidifier, and apply that via a venturi syphon about once per week. Prior to getting that figured out, I used trashcans and buckets - which took a lot of time. Usually also with some water soluble fertilizers, mostly Ammonium sulfate. In between the weekly acid waterings, I apply tap water from the hose when needed. Sometimes daily when it's hot. Blueberries are unforgiving if you let them go too long without water.
A couple years ago I tried dry citric acid, which is considered organic. It was easier to use, but it was not nearly as effective so I've gone back to battery acid.
As others have mentioned, be careful with the acid. With my tap water, which is very hard, the formula I fell upon is the following. (I use an intermediate step with the acid dilution - it's just easier to work with since the battery acid comes in a carton with rubber tubing, which is just plain awkward to work with. I put 2 cups of battery acid into smaller plastic bottles. Then I add one of those 2 cup bottles to water to bring it to full in a one gallon bottle. (always add acid to water). This dilution (2C acid in 1 gallon H2O) is then used at 1 cup per 32 gallon water in a trash can, or equal if you are using a (hozon) venturi syphon set up (which fortunately dilutes at 16:1).
When I started a number of years ago, there was very little reliable information for homeowners about how to grow Southern Highbush, much less in containers. I was lucky and figured out what worked well and am sticking with it.
In my location, I need really low chill plants since frost here is rare. Those that need 400 hours are just on the cusp of acceptable. And I do like the early berries, though most years the birds get most of those. Last year on Christmas day I picked 2 pounds, which was an unexpected bonus. That likely won't happen this year.
We could get rain in the next 24 hours or so. Keep your fingers crossed!