The advantage of these methods that people with straighter hair use is that they tangle the hair from the start which gives it a jump start. Locs are just tangled hair. With the methods that most Black people use, they have to wait for the hair to tangle on itself.
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The process is fairly simple. Gather the section in your fingers and twirl it. I spin clockwise relative to my face. I don't know if this is relevant. Don't twist it too tight, or when you go to rip it, it will bunch up way too densely to reach the root end of your hair, and you'll end up with a long length of straight hair between the knots and your roots. Instead, twirl lightly.
Then slide your fingers slowly toward the tip of the bunch, until you feel the end of some hair. Next, split that bunch into two, and pull it apart. The crotch of the separated bunch should slide down to the scalp. Don't pull too hard. You may not be able to see, but you just made a thin layer of tangles.
Now, without retwisting, grab a little bit of hair from one half of the bundle and pull it into the other half. You only need to retwist every three or four rips, or when the hair gets too bulbous.
When that time comes, hold the knotted section in your fingers and roll it so it's even. Use this action to push any loose loops up into the bundle of unknotted hair. Then retwist and repeat. Once you get a good layer of knots between your scalp and the ripping, you can pull the hair apart pretty hard. Just don't go pulling your hair out.
