To really follow her method would require you to get her book which I did. Unless you are very serious about that method, it can be a bit pricey to buy. Maybe a library would have a copy you could borrow. (Yes I actually mean one of those things they used to print on paper.) There are sections in many plant type forums with titles that will remind you of her approach but there is so much more information in the book itself than you will ever find on line.
The bare bones essence of an NPT is that you place some low fertility dirt or potting soil about an inch deep in the tank and wet it. Then you cover that layer with a moderately coarse gravel layer maybe a half inch thick to allow some water to circulate down to the surface of that soil while keeping the soil from turning to floating mud in the tank. Plant heavily with a variety of plants all at once and use about 2 WPG or more of light, unless you can get some direct sunlight. Some of the plants will thrive and others will not, that is how you choose which ones to keep. In my case at 2 1/2 WPG the vals and cryptocorynes thrived. Don't forget to use surface floating plants along with the plants in the substrate, I use duckweed but others you could use include water lettuce and frogbit. Do not add any fertilizers or CO2 ever. The plants get their food from the fish waste and the minerals in the rare water changes. Make sure you have decent water flow throughout the tank but a filter "is not needed". (I just will not go there)
The method works and I do a water change of about 50% every 6 months or so whether it needs it or not. Last time I did a water change, I measured the nitrates first and found them at around 10 ppm or a bit less. The fish in that tank are among the best and healthiest fish that I have. As you can see from the picture, there is a heavy fish population.
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