I start early on plants that I know will become size issues. Each little break in the stem that you make when supercropping will strengthen the area immediately surrounding it within a week or two. You could start by just going around and cropping each branch in a similar spot, then the next day, do another spot on each, and so on. I usually give each spot time to heal before cropping the plant again in close to the same place-I spread them out and then go back and crop the weak points. You can get a freakishly strong frame if you crop it in the right spots. Keep in mind, this works better on some plants than others. Some plants will always need support at the end-they either just grow too fast/big. You can control the height during flower by supercropping the canopy flat every day, but those branches are still growing so you end up winding those very long branches around the canopy at the same height, and then when you chop the plant and hang it upside down, the branches are now taller than the tent if you stretch out the part you supercropped.
I would just start by cropping each branch and then seeing how the plant reacts. If you get some promising results, keep going and try to think of the weak spots on each branch as the plant grows, and crop those spots. Lots of times you'll get plants that are almost strong enough to support themselves, but you end up needing a single bamboo pole in each pot to anchor it to-I still think that's a success. You'll get tons of hybrids and indica types that don't need any support if you do this, but plenty of sativas that do. Some plants have "wet noodle branches" and just don't cooperate with any amount of supercropping.
Good luck, please give me an update in a couple of weeks, I'd like to see if it's working.