First start out layering 3-4 thin layers of wool, one on top of another. If you can see in the pictures I used two different colors to try to show you that I layered them with the fibers going in opposite directions. KWIM. So I lay out one thin layer then turn the square once then lay out another layer, then turn the square once etc. In this picture I have the bottom layer in orange, vertical in the picture. Then I have a second layer of orange, horizontal, then a layer of blue, vertical.
When it is all done I just dump it out into my hand, wring out the water and lay it on a towel to dry. Simple, quick and anyone can do it. I bought my wool from Outback Fibers but there are probably lots of companies that sell wool you can use.