LOL--well, I couldn't resist looking at this thread. Blackberry can be a tough little wine to handle for a beginner but if you do it the way I describe, you'll get a good result.
We freeze the fruit first--after it thaws, you'll have tons of juice. Do not dilute with water if you want big flavor--it will taste just like a blackberry pie. But if you want a lighter style, add some water to it but be conservative so you don't kill the flavor.
You HAVE to have a PH meter to successfully adjust the PH on this fruit. If you don't get the PH in line, you'll NEVER be able to adjust it post-ferment with potassium carbonate because you don't dare use that much potassium carbonate to move the PH so much. You use CALCIUM carbonate to adjust your PH PRE-FERMENT. We are using wild blackberries and the PH comes in at 2.8 or 2.9 We use calcium carbonate to bring the PH to 3.4 When you use calcium carbonate, add only 1/4 tsp at a time--stir VERY well, and then retest. As you come close to the target PH, use less---and walk away from it for 15 or 20 minutes so it all integrates before final testing. You don't want to over-dose and over-shoot the target by a whole lot.
If you have a big batch of berries, 100# or so, you need to layer in a proper dose of metabisulfite into the thawing fruit so you don't get biological growth---it can take 2 or 3 days for this much must to thaw and come to room temp and you don't want any bacteria to get a head start or your ferment will be sluggish or become stuck.
This is a malic acid fruit. You should use 71B as your culture because it metabolizes about 20% of the malic and makes the wine nice and smooth. Blackberry done without 71B is very harsh at the end and then you have to resort to other tactics to smooth it out. When you use 71B, Scott Labs recommends hydrating it with Go-Ferm. 71B is sensitive to competitive factors and dominate wild yeast, which is why you should rehydrate it. The Go-Ferm provides micro-nutrient and doesn't contain ammonia salts, that can be toxic to some yeast, like other nutrients do.
I'm sure there are more questions, and I didn't touch on dose of meta, etc. and some other typical winemaking technique because I don't know how experienced you are at winemaking. But if you have more questions or are totally confused--let us know.
Another important thing---you don't want the seeds from the fruit to get over in the secondary. Aging on seeds will make the wine bitter. We bag this fruit---but if you don't, you'll have to run the wine thru a fine screen or paint strainer, etc when you rack off the primary in order to catch the seeds.