I actually get asked that a lot, so Im going to make a pic tut on it when I start these Madonna's in about a week. As far as the actual training, I never top any plant, just gets rid of a good bud site I could be getting herb from. I dont super crop or anything like that either, at least not on purpose. I do brake the occasional branch ad sometimes it seems like the growth is better and sometimes it seems worse. But anyways, with the training into the screen, I generally start out with small to medium clones(6"-18"). I put them into the flower room and flip the lights the same day, which means no training into the screen before 12/12. The small clones generally arent even touching the screen when the lights get flipped(Blue Kush this run) and the larger ones(Piss this run) usually only have 3-4 branches that actually poke through the screen. When a branch pokes through the screen by about 2"-4" I pull it back underneath(no weaving) and move it to the next hole further away from the branch. I repeat this process on all branches throughout the entire flower stretch. It keeps the canopy very even and level. And in a nut shell, thats how I fill my screen. I determine how many plants to use based on clone size when Im putting them in the flower room. This grow for example, I had 4 medium(14") Piss clones that filled out the screen pretty well(there was a small open spot in the back middle, not normal for me)but I had never grown this strain in my setup and expected them to stretch more than they did. And on the Blue Kush side, I used 5 small clones(6"-10") and they actually stretched more than I expected and are on the verge of overfilling my screen. The last run was a little easier to see, where I ran 3 medium Blue Kush clones(18") on the left side and 6 small Blue Kush clones(6"-8") on the right side. Both sides the screen was fully filled out and both sides yielded a pound each with only a 6g variance. On this up comming Madonna run, I will be running 6 small(6") clones. I have also never run this strain in my setup and have no idea what the strech in flower would be, but Im just taking a guess based of how it grows in veg(the mother) Hope this helps, and when I get to it I will have the training tut up. Feel free to browes through the hole journal, my last 5 grows are in it. There is a ton of info and even more pics. And if you have any other questions, feel free to ask.