Here's how I do it.
I have my mixing buckets...regular 5 g buckets and I'll put about a gallon bags worth of frozen trim/smalls in the bucket, with a few inches of ice above and below it, then fill it with water above the ice and let it soak 15 minutes to saturate everything, with a few light stirrings. I usually have 3-4 buckets going.
Then I have another 5 gal. bucket with lots of big holes drilled in it. About 3/4" holes all over the sides and bottom, then I stack my bags in here. I only use the 36, 72, 90....those are the good ones. and I save 120 for food. I let the 25 go right down the drain!
So I have a total of 5 bags stacked...the 36,72,90, 120, and your work bag on top.
So now the material has been soaking for 15-20 minutes in ice water...you can mix it with the paint stirrer...gently, just for a few minutes the first time. The first run is usually the best stuff but you can keep re- running it until you stop getting hash...Usually at least 3-4 times, but I have gone 5-6 before. Then pour it through your bags. A laundry sink works great!! If you have more buckets, dump them through the screens.
THEN, you can pull your bags and collect the hash. You scrape it off gthe bottom with a plastic card then squeeze out the excess moisture. You can gte it to collect by bouncing the bag up and down quickly. Kinsd of a snapping motion gets it to gel together. Then I just use a towel and step on it inside a screen, then put it on a [piece of cardboard to dry...the cardboard helps pull the moisture out.
You'll be able to sample some while you work, but it'll be better tomorrow after drying some more. Then yo can press it, or chop it up, or whatever you want.
It is a lot of work and I always have a sore back the next day pouring all those buckets full of ice water and shaking the bags, etc. but I usually wind up with an ounce of full melt hash out of trim that would have been thrown away.
You'll gte better at it as time goes by, like everything.
Then I clean my bags good after by soaking them in a vinegar and dishsoap solution then wash them in the washing machine. I have the Bubble Bag Dude brand and they have been used 15+ times and still in good shape.
Have fun with it...Great sleep med!